1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* Validate parameters */ 102 init = &cp->init; 103 if (ntohl(init->initiate_tag) == 0) { 104 goto outnow; 105 } 106 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 107 (ntohs(init->num_inbound_streams) == 0) || 108 (ntohs(init->num_outbound_streams) == 0)) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 111 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 112 mflowtype, mflowid, inp->fibnum, 113 vrf_id, port); 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 122 mflowtype, mflowid, inp->fibnum, 123 vrf_id, port); 124 goto outnow; 125 } 126 /* We are only accepting if we have a listening socket. */ 127 if ((stcb == NULL) && 128 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 129 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 130 (!SCTP_IS_LISTENING(inp)))) { 131 /* 132 * FIX ME ?? What about TCP model and we have a 133 * match/restart case? Actually no fix is needed. the lookup 134 * will always find the existing assoc so stcb would not be 135 * NULL. It may be questionable to do this since we COULD 136 * just send back the INIT-ACK and hope that the app did 137 * accept()'s by the time the COOKIE was sent. But there is 138 * a price to pay for COOKIE generation and I don't want to 139 * pay it on the chance that the app will actually do some 140 * accepts(). The App just looses and should NOT be in this 141 * state :-) 142 */ 143 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 144 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 145 "No listener"); 146 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 147 mflowtype, mflowid, inp->fibnum, 148 vrf_id, port); 149 } 150 goto outnow; 151 } 152 if ((stcb != NULL) && 153 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 154 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 155 sctp_send_shutdown_ack(stcb, NULL); 156 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 157 } else { 158 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 159 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 160 src, dst, sh, cp, 161 mflowtype, mflowid, 162 vrf_id, port); 163 } 164 outnow: 165 if (stcb == NULL) { 166 SCTP_INP_RUNLOCK(inp); 167 } 168 } 169 170 /* 171 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 172 */ 173 174 int 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 176 { 177 int unsent_data; 178 unsigned int i; 179 struct sctp_stream_queue_pending *sp; 180 struct sctp_association *asoc; 181 182 SCTP_TCB_LOCK_ASSERT(stcb); 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 192 /* Check to see if some data queued */ 193 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 194 /* sa_ignore FREED_MEMORY */ 195 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 196 if (sp == NULL) { 197 continue; 198 } 199 if ((sp->msg_is_complete) && 200 (sp->length == 0) && 201 (sp->sender_all_done)) { 202 /* 203 * We are doing differed cleanup. Last time 204 * through when we took all the data the 205 * sender_all_done was not set. 206 */ 207 if (sp->put_last_out == 0) { 208 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 209 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 210 sp->sender_all_done, 211 sp->length, 212 sp->msg_is_complete, 213 sp->put_last_out); 214 } 215 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 216 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 217 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 218 if (sp->net) { 219 sctp_free_remote_addr(sp->net); 220 sp->net = NULL; 221 } 222 if (sp->data) { 223 sctp_m_freem(sp->data); 224 sp->data = NULL; 225 } 226 sctp_free_a_strmoq(stcb, sp, so_locked); 227 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 228 unsent_data++; 229 } 230 } else { 231 unsent_data++; 232 } 233 if (unsent_data > 0) { 234 break; 235 } 236 } 237 } 238 return (unsent_data); 239 } 240 241 static int 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 243 { 244 struct sctp_init *init; 245 struct sctp_association *asoc; 246 struct sctp_nets *lnet; 247 unsigned int i; 248 249 SCTP_TCB_LOCK_ASSERT(stcb); 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 269 unsigned int newcnt; 270 struct sctp_stream_out *outs; 271 struct sctp_stream_queue_pending *sp, *nsp; 272 struct sctp_tmit_chunk *chk, *nchk; 273 274 /* abandon the upper streams */ 275 newcnt = ntohs(init->num_inbound_streams); 276 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 277 if (chk->rec.data.sid >= newcnt) { 278 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 279 asoc->send_queue_cnt--; 280 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 281 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 282 #ifdef INVARIANTS 283 } else { 284 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 285 #endif 286 } 287 if (chk->data != NULL) { 288 sctp_free_bufspace(stcb, asoc, chk, 1); 289 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 290 0, chk, SCTP_SO_NOT_LOCKED); 291 if (chk->data) { 292 sctp_m_freem(chk->data); 293 chk->data = NULL; 294 } 295 } 296 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 297 /* sa_ignore FREED_MEMORY */ 298 } 299 } 300 if (asoc->strmout) { 301 for (i = newcnt; i < asoc->pre_open_streams; i++) { 302 outs = &asoc->strmout[i]; 303 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 304 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 305 TAILQ_REMOVE(&outs->outqueue, sp, next); 306 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 307 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 308 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 309 if (sp->data) { 310 sctp_m_freem(sp->data); 311 sp->data = NULL; 312 } 313 if (sp->net) { 314 sctp_free_remote_addr(sp->net); 315 sp->net = NULL; 316 } 317 /* Free the chunk */ 318 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 319 /* sa_ignore FREED_MEMORY */ 320 } 321 outs->state = SCTP_STREAM_CLOSED; 322 } 323 } 324 /* cut back the count */ 325 asoc->pre_open_streams = newcnt; 326 } 327 asoc->streamoutcnt = asoc->pre_open_streams; 328 if (asoc->strmout) { 329 for (i = 0; i < asoc->streamoutcnt; i++) { 330 asoc->strmout[i].state = SCTP_STREAM_OPEN; 331 } 332 } 333 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 334 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 336 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 337 } 338 /* This is the next one we expect */ 339 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 340 341 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 342 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 343 344 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 345 /* open the requested streams */ 346 347 if (asoc->strmin != NULL) { 348 /* Free the old ones */ 349 for (i = 0; i < asoc->streamincnt; i++) { 350 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 351 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 352 } 353 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 354 } 355 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 356 asoc->streamincnt = ntohs(init->num_outbound_streams); 357 } else { 358 asoc->streamincnt = asoc->max_inbound_streams; 359 } 360 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 361 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 362 if (asoc->strmin == NULL) { 363 /* we didn't get memory for the streams! */ 364 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 365 return (-1); 366 } 367 for (i = 0; i < asoc->streamincnt; i++) { 368 asoc->strmin[i].sid = i; 369 asoc->strmin[i].last_mid_delivered = 0xffffffff; 370 TAILQ_INIT(&asoc->strmin[i].inqueue); 371 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 372 asoc->strmin[i].pd_api_started = 0; 373 asoc->strmin[i].delivery_started = 0; 374 } 375 /* 376 * load_address_from_init will put the addresses into the 377 * association when the COOKIE is processed or the INIT-ACK is 378 * processed. Both types of COOKIE's existing and new call this 379 * routine. It will remove addresses that are no longer in the 380 * association (for the restarting case where addresses are 381 * removed). Up front when the INIT arrives we will discard it if it 382 * is a restart and new addresses have been added. 383 */ 384 /* sa_ignore MEMLEAK */ 385 return (0); 386 } 387 388 /* 389 * INIT-ACK message processing/consumption returns value < 0 on error 390 */ 391 static int 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 393 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 394 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 395 struct sctp_nets *net, int *abort_no_unlock, 396 uint8_t mflowtype, uint32_t mflowid, 397 uint32_t vrf_id) 398 { 399 struct sctp_association *asoc; 400 struct mbuf *op_err; 401 int retval, abort_flag, cookie_found; 402 int initack_limit; 403 int nat_friendly = 0; 404 405 /* First verify that we have no illegal param's */ 406 abort_flag = 0; 407 cookie_found = 0; 408 409 op_err = sctp_arethere_unrecognized_parameters(m, 410 (offset + sizeof(struct sctp_init_chunk)), 411 &abort_flag, (struct sctp_chunkhdr *)cp, 412 &nat_friendly, &cookie_found); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 if (!cookie_found) { 420 uint16_t len; 421 422 /* Only report the missing cookie parameter */ 423 if (op_err != NULL) { 424 sctp_m_freem(op_err); 425 } 426 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 427 /* We abort with an error of missing mandatory param */ 428 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 429 if (op_err != NULL) { 430 struct sctp_error_missing_param *cause; 431 432 SCTP_BUF_LEN(op_err) = len; 433 cause = mtod(op_err, struct sctp_error_missing_param *); 434 /* Subtract the reserved param */ 435 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 436 cause->cause.length = htons(len); 437 cause->num_missing_params = htonl(1); 438 cause->type[0] = htons(SCTP_STATE_COOKIE); 439 } 440 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 441 src, dst, sh, op_err, 442 mflowtype, mflowid, 443 vrf_id, net->port); 444 *abort_no_unlock = 1; 445 return (-3); 446 } 447 asoc = &stcb->asoc; 448 asoc->peer_supports_nat = (uint8_t)nat_friendly; 449 /* process the peer's parameters in the INIT-ACK */ 450 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 451 if (op_err != NULL) { 452 sctp_m_freem(op_err); 453 } 454 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 455 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 456 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 457 src, dst, sh, op_err, 458 mflowtype, mflowid, 459 vrf_id, net->port); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 initack_limit = offset + ntohs(cp->ch.chunk_length); 464 /* load all addresses */ 465 if ((retval = sctp_load_addresses_from_init(stcb, m, 466 offset + sizeof(struct sctp_init_chunk), 467 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 468 if (op_err != NULL) { 469 sctp_m_freem(op_err); 470 } 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 493 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 494 stcb->asoc.local_hmacs); 495 if (op_err) { 496 sctp_queue_op_err(stcb, op_err); 497 /* queuing will steal away the mbuf chain to the out queue */ 498 op_err = NULL; 499 } 500 /* extract the cookie and queue it to "echo" it back... */ 501 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 502 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 503 stcb->asoc.overall_error_count, 504 0, 505 SCTP_FROM_SCTP_INPUT, 506 __LINE__); 507 } 508 stcb->asoc.overall_error_count = 0; 509 net->error_count = 0; 510 511 /* 512 * Cancel the INIT timer, We do this first before queueing the 513 * cookie. We always cancel at the primary to assume that we are 514 * canceling the timer started by the INIT which always goes to the 515 * primary. 516 */ 517 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 518 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 519 520 /* calculate the RTO */ 521 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 522 SCTP_RTT_FROM_NON_DATA); 523 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 524 return (retval); 525 } 526 527 static void 528 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 529 struct sctp_tcb *stcb, struct sctp_nets *net) 530 { 531 union sctp_sockstore store; 532 struct sctp_nets *r_net, *f_net; 533 struct timeval tv; 534 int req_prim = 0; 535 uint16_t old_error_counter; 536 537 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 538 /* Invalid length */ 539 return; 540 } 541 542 memset(&store, 0, sizeof(store)); 543 switch (cp->heartbeat.hb_info.addr_family) { 544 #ifdef INET 545 case AF_INET: 546 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 547 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 548 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 549 store.sin.sin_port = stcb->rport; 550 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 551 sizeof(store.sin.sin_addr)); 552 } else { 553 return; 554 } 555 break; 556 #endif 557 #ifdef INET6 558 case AF_INET6: 559 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 560 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 561 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 562 store.sin6.sin6_port = stcb->rport; 563 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 564 } else { 565 return; 566 } 567 break; 568 #endif 569 default: 570 return; 571 } 572 r_net = sctp_findnet(stcb, &store.sa); 573 if (r_net == NULL) { 574 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 575 return; 576 } 577 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 578 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 579 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 580 /* 581 * If the its a HB and it's random value is correct when can 582 * confirm the destination. 583 */ 584 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 585 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 586 stcb->asoc.primary_destination = r_net; 587 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 588 f_net = TAILQ_FIRST(&stcb->asoc.nets); 589 if (f_net != r_net) { 590 /* 591 * first one on the list is NOT the primary 592 * sctp_cmpaddr() is much more efficient if 593 * the primary is the first on the list, 594 * make it so. 595 */ 596 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 597 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 598 } 599 req_prim = 1; 600 } 601 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 602 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 603 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 604 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 605 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 606 } 607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 608 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 609 stcb->asoc.overall_error_count, 610 0, 611 SCTP_FROM_SCTP_INPUT, 612 __LINE__); 613 } 614 stcb->asoc.overall_error_count = 0; 615 old_error_counter = r_net->error_count; 616 r_net->error_count = 0; 617 r_net->hb_responded = 1; 618 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 619 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 620 /* Now lets do a RTO with this */ 621 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 622 SCTP_RTT_FROM_NON_DATA); 623 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 624 r_net->dest_state |= SCTP_ADDR_REACHABLE; 625 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 626 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 627 } 628 if (r_net->dest_state & SCTP_ADDR_PF) { 629 r_net->dest_state &= ~SCTP_ADDR_PF; 630 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 631 } 632 if (old_error_counter > 0) { 633 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 634 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 635 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 636 } 637 if (r_net == stcb->asoc.primary_destination) { 638 if (stcb->asoc.alternate) { 639 /* release the alternate, primary is good */ 640 sctp_free_remote_addr(stcb->asoc.alternate); 641 stcb->asoc.alternate = NULL; 642 } 643 } 644 /* Mobility adaptation */ 645 if (req_prim) { 646 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 647 SCTP_MOBILITY_BASE) || 648 sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_FASTHANDOFF)) && 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_PRIM_DELETED)) { 652 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 653 stcb->sctp_ep, stcb, NULL, 654 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 655 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_FASTHANDOFF)) { 657 sctp_assoc_immediate_retrans(stcb, 658 stcb->asoc.primary_destination); 659 } 660 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 661 SCTP_MOBILITY_BASE)) { 662 sctp_move_chunks_from_net(stcb, 663 stcb->asoc.deleted_primary); 664 } 665 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 666 } 667 } 668 } 669 670 static int 671 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 672 { 673 /* 674 * Return 0 means we want you to proceed with the abort non-zero 675 * means no abort processing. 676 */ 677 uint32_t new_vtag; 678 struct sctpasochead *head; 679 680 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 681 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 682 atomic_add_int(&stcb->asoc.refcnt, 1); 683 SCTP_TCB_UNLOCK(stcb); 684 SCTP_INP_INFO_WLOCK(); 685 SCTP_TCB_LOCK(stcb); 686 atomic_subtract_int(&stcb->asoc.refcnt, 1); 687 } else { 688 return (0); 689 } 690 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 691 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 692 /* generate a new vtag and send init */ 693 LIST_REMOVE(stcb, sctp_asocs); 694 stcb->asoc.my_vtag = new_vtag; 695 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 696 /* 697 * put it in the bucket in the vtag hash of assoc's for the 698 * system 699 */ 700 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 701 SCTP_INP_INFO_WUNLOCK(); 702 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 703 return (1); 704 } else { 705 /* 706 * treat like a case where the cookie expired i.e.: - dump 707 * current cookie. - generate a new vtag. - resend init. 708 */ 709 /* generate a new vtag and send init */ 710 LIST_REMOVE(stcb, sctp_asocs); 711 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 712 sctp_stop_all_cookie_timers(stcb); 713 sctp_toss_old_cookies(stcb, &stcb->asoc); 714 stcb->asoc.my_vtag = new_vtag; 715 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 716 /* 717 * put it in the bucket in the vtag hash of assoc's for the 718 * system 719 */ 720 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 721 SCTP_INP_INFO_WUNLOCK(); 722 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 723 return (1); 724 } 725 return (0); 726 } 727 728 static int 729 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 730 struct sctp_nets *net) 731 { 732 /* 733 * return 0 means we want you to proceed with the abort non-zero 734 * means no abort processing 735 */ 736 if (stcb->asoc.auth_supported == 0) { 737 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 738 return (0); 739 } 740 sctp_asconf_send_nat_state_update(stcb, net); 741 return (1); 742 } 743 744 /* Returns 1 if the stcb was aborted, 0 otherwise */ 745 static int 746 sctp_handle_abort(struct sctp_abort_chunk *abort, 747 struct sctp_tcb *stcb, struct sctp_nets *net) 748 { 749 uint16_t len; 750 uint16_t error; 751 752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 753 if (stcb == NULL) 754 return (0); 755 756 len = ntohs(abort->ch.chunk_length); 757 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 758 /* 759 * Need to check the cause codes for our two magic nat 760 * aborts which don't kill the assoc necessarily. 761 */ 762 struct sctp_error_cause *cause; 763 764 cause = (struct sctp_error_cause *)(abort + 1); 765 error = ntohs(cause->code); 766 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 767 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 768 abort->ch.chunk_flags); 769 if (sctp_handle_nat_colliding_state(stcb)) { 770 return (0); 771 } 772 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 773 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 774 abort->ch.chunk_flags); 775 if (sctp_handle_nat_missing_state(stcb, net)) { 776 return (0); 777 } 778 } 779 } else { 780 error = 0; 781 } 782 /* stop any receive timers */ 783 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 784 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 785 /* notify user of the abort and clean up... */ 786 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 787 /* free the tcb */ 788 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 789 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 790 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 791 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 792 } 793 #ifdef SCTP_ASOCLOG_OF_TSNS 794 sctp_print_out_track_log(stcb); 795 #endif 796 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 797 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 798 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 799 return (1); 800 } 801 802 static void 803 sctp_start_net_timers(struct sctp_tcb *stcb) 804 { 805 uint32_t cnt_hb_sent; 806 struct sctp_nets *net; 807 808 cnt_hb_sent = 0; 809 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 810 /* 811 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 812 * If the dest in unconfirmed send a hb as well if under 813 * max_hb_burst have been sent. 814 */ 815 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 816 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 817 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 818 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 819 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 820 cnt_hb_sent++; 821 } 822 } 823 if (cnt_hb_sent) { 824 sctp_chunk_output(stcb->sctp_ep, stcb, 825 SCTP_OUTPUT_FROM_COOKIE_ACK, 826 SCTP_SO_NOT_LOCKED); 827 } 828 } 829 830 static void 831 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 832 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 833 { 834 struct sctp_association *asoc; 835 int some_on_streamwheel; 836 int old_state; 837 838 SCTPDBG(SCTP_DEBUG_INPUT2, 839 "sctp_handle_shutdown: handling SHUTDOWN\n"); 840 if (stcb == NULL) 841 return; 842 asoc = &stcb->asoc; 843 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 844 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 845 return; 846 } 847 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 848 /* Shutdown NOT the expected size */ 849 return; 850 } 851 old_state = SCTP_GET_STATE(stcb); 852 sctp_update_acked(stcb, cp, abort_flag); 853 if (*abort_flag) { 854 return; 855 } 856 if (asoc->control_pdapi) { 857 /* 858 * With a normal shutdown we assume the end of last record. 859 */ 860 SCTP_INP_READ_LOCK(stcb->sctp_ep); 861 if (asoc->control_pdapi->on_strm_q) { 862 struct sctp_stream_in *strm; 863 864 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 865 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 866 /* Unordered */ 867 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 868 asoc->control_pdapi->on_strm_q = 0; 869 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 870 /* Ordered */ 871 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 872 asoc->control_pdapi->on_strm_q = 0; 873 #ifdef INVARIANTS 874 } else { 875 panic("Unknown state on ctrl:%p on_strm_q:%d", 876 asoc->control_pdapi, 877 asoc->control_pdapi->on_strm_q); 878 #endif 879 } 880 } 881 asoc->control_pdapi->end_added = 1; 882 asoc->control_pdapi->pdapi_aborted = 1; 883 asoc->control_pdapi = NULL; 884 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 885 if (stcb->sctp_socket) { 886 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 887 } 888 } 889 /* goto SHUTDOWN_RECEIVED state to block new requests */ 890 if (stcb->sctp_socket) { 891 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 892 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 893 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 894 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 895 /* 896 * notify upper layer that peer has initiated a 897 * shutdown 898 */ 899 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 900 901 /* reset time */ 902 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 903 } 904 } 905 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 906 /* 907 * stop the shutdown timer, since we WILL move to 908 * SHUTDOWN-ACK-SENT. 909 */ 910 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 911 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 912 } 913 /* Now is there unsent data on a stream somewhere? */ 914 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 915 916 if (!TAILQ_EMPTY(&asoc->send_queue) || 917 !TAILQ_EMPTY(&asoc->sent_queue) || 918 some_on_streamwheel) { 919 /* By returning we will push more data out */ 920 return; 921 } else { 922 /* no outstanding data to send, so move on... */ 923 /* send SHUTDOWN-ACK */ 924 /* move to SHUTDOWN-ACK-SENT state */ 925 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 926 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 927 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 928 } 929 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 930 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 931 sctp_stop_timers_for_shutdown(stcb); 932 sctp_send_shutdown_ack(stcb, net); 933 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 934 stcb->sctp_ep, stcb, net); 935 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 936 sctp_send_shutdown_ack(stcb, net); 937 } 938 } 939 } 940 941 static void 942 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 943 struct sctp_tcb *stcb, 944 struct sctp_nets *net) 945 { 946 struct sctp_association *asoc; 947 948 SCTPDBG(SCTP_DEBUG_INPUT2, 949 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 950 if (stcb == NULL) 951 return; 952 953 asoc = &stcb->asoc; 954 /* process according to association state */ 955 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 956 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 957 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 958 sctp_send_shutdown_complete(stcb, net, 1); 959 SCTP_TCB_UNLOCK(stcb); 960 return; 961 } 962 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 963 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 964 /* unexpected SHUTDOWN-ACK... so ignore... */ 965 SCTP_TCB_UNLOCK(stcb); 966 return; 967 } 968 if (asoc->control_pdapi) { 969 /* 970 * With a normal shutdown we assume the end of last record. 971 */ 972 SCTP_INP_READ_LOCK(stcb->sctp_ep); 973 asoc->control_pdapi->end_added = 1; 974 asoc->control_pdapi->pdapi_aborted = 1; 975 asoc->control_pdapi = NULL; 976 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 977 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 978 } 979 #ifdef INVARIANTS 980 if (!TAILQ_EMPTY(&asoc->send_queue) || 981 !TAILQ_EMPTY(&asoc->sent_queue) || 982 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 983 panic("Queues are not empty when handling SHUTDOWN-ACK"); 984 } 985 #endif 986 /* stop the timer */ 987 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 988 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 989 /* send SHUTDOWN-COMPLETE */ 990 sctp_send_shutdown_complete(stcb, net, 0); 991 /* notify upper layer protocol */ 992 if (stcb->sctp_socket) { 993 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 994 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 995 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 996 } 997 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 998 } 999 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1000 /* free the TCB but first save off the ep */ 1001 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1002 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1003 } 1004 1005 static void 1006 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1007 { 1008 switch (chunk_type) { 1009 case SCTP_ASCONF_ACK: 1010 case SCTP_ASCONF: 1011 sctp_asconf_cleanup(stcb); 1012 break; 1013 case SCTP_IFORWARD_CUM_TSN: 1014 case SCTP_FORWARD_CUM_TSN: 1015 stcb->asoc.prsctp_supported = 0; 1016 break; 1017 default: 1018 SCTPDBG(SCTP_DEBUG_INPUT2, 1019 "Peer does not support chunk type %d (0x%x).\n", 1020 chunk_type, chunk_type); 1021 break; 1022 } 1023 } 1024 1025 /* 1026 * Skip past the param header and then we will find the param that caused the 1027 * problem. There are a number of param's in a ASCONF OR the prsctp param 1028 * these will turn of specific features. 1029 * XXX: Is this the right thing to do? 1030 */ 1031 static void 1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1033 { 1034 switch (parameter_type) { 1035 /* pr-sctp draft */ 1036 case SCTP_PRSCTP_SUPPORTED: 1037 stcb->asoc.prsctp_supported = 0; 1038 break; 1039 case SCTP_SUPPORTED_CHUNK_EXT: 1040 break; 1041 /* draft-ietf-tsvwg-addip-sctp */ 1042 case SCTP_HAS_NAT_SUPPORT: 1043 stcb->asoc.peer_supports_nat = 0; 1044 break; 1045 case SCTP_ADD_IP_ADDRESS: 1046 case SCTP_DEL_IP_ADDRESS: 1047 case SCTP_SET_PRIM_ADDR: 1048 stcb->asoc.asconf_supported = 0; 1049 break; 1050 case SCTP_SUCCESS_REPORT: 1051 case SCTP_ERROR_CAUSE_IND: 1052 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1053 SCTPDBG(SCTP_DEBUG_INPUT2, 1054 "Turning off ASCONF to this strange peer\n"); 1055 stcb->asoc.asconf_supported = 0; 1056 break; 1057 default: 1058 SCTPDBG(SCTP_DEBUG_INPUT2, 1059 "Peer does not support param type %d (0x%x)??\n", 1060 parameter_type, parameter_type); 1061 break; 1062 } 1063 } 1064 1065 static int 1066 sctp_handle_error(struct sctp_chunkhdr *ch, 1067 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1068 { 1069 struct sctp_error_cause *cause; 1070 struct sctp_association *asoc; 1071 uint32_t remaining_length, adjust; 1072 uint16_t code, cause_code, cause_length; 1073 1074 /* parse through all of the errors and process */ 1075 asoc = &stcb->asoc; 1076 cause = (struct sctp_error_cause *)((caddr_t)ch + 1077 sizeof(struct sctp_chunkhdr)); 1078 remaining_length = ntohs(ch->chunk_length); 1079 if (remaining_length > limit) { 1080 remaining_length = limit; 1081 } 1082 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1083 remaining_length -= sizeof(struct sctp_chunkhdr); 1084 } else { 1085 remaining_length = 0; 1086 } 1087 code = 0; 1088 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1089 /* Process an Error Cause */ 1090 cause_code = ntohs(cause->code); 1091 cause_length = ntohs(cause->length); 1092 if ((cause_length > remaining_length) || (cause_length == 0)) { 1093 /* Invalid cause length, possibly due to truncation. */ 1094 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1095 remaining_length, cause_length); 1096 return (0); 1097 } 1098 if (code == 0) { 1099 /* report the first error cause */ 1100 code = cause_code; 1101 } 1102 switch (cause_code) { 1103 case SCTP_CAUSE_INVALID_STREAM: 1104 case SCTP_CAUSE_MISSING_PARAM: 1105 case SCTP_CAUSE_INVALID_PARAM: 1106 case SCTP_CAUSE_NO_USER_DATA: 1107 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1108 cause_code); 1109 break; 1110 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1111 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1112 ch->chunk_flags); 1113 if (sctp_handle_nat_colliding_state(stcb)) { 1114 return (0); 1115 } 1116 break; 1117 case SCTP_CAUSE_NAT_MISSING_STATE: 1118 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1119 ch->chunk_flags); 1120 if (sctp_handle_nat_missing_state(stcb, net)) { 1121 return (0); 1122 } 1123 break; 1124 case SCTP_CAUSE_STALE_COOKIE: 1125 /* 1126 * We only act if we have echoed a cookie and are 1127 * waiting. 1128 */ 1129 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1130 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1131 struct sctp_error_stale_cookie *stale_cookie; 1132 1133 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1134 /* stable_time is in usec, convert to msec. */ 1135 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000; 1136 /* Double it to be more robust on RTX. */ 1137 asoc->cookie_preserve_req *= 2; 1138 asoc->stale_cookie_count++; 1139 if (asoc->stale_cookie_count > 1140 asoc->max_init_times) { 1141 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1142 /* now free the asoc */ 1143 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1145 return (-1); 1146 } 1147 /* blast back to INIT state */ 1148 sctp_toss_old_cookies(stcb, &stcb->asoc); 1149 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1150 sctp_stop_all_cookie_timers(stcb); 1151 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1152 } 1153 break; 1154 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1155 /* 1156 * Nothing we can do here, we don't do hostname 1157 * addresses so if the peer does not like my IPv6 1158 * (or IPv4 for that matter) it does not matter. If 1159 * they don't support that type of address, they can 1160 * NOT possibly get that packet type... i.e. with no 1161 * IPv6 you can't receive a IPv6 packet. so we can 1162 * safely ignore this one. If we ever added support 1163 * for HOSTNAME Addresses, then we would need to do 1164 * something here. 1165 */ 1166 break; 1167 case SCTP_CAUSE_UNRECOG_CHUNK: 1168 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1169 struct sctp_error_unrecognized_chunk *unrec_chunk; 1170 1171 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1172 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1173 } 1174 break; 1175 case SCTP_CAUSE_UNRECOG_PARAM: 1176 /* XXX: We only consider the first parameter */ 1177 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1178 struct sctp_paramhdr *unrec_parameter; 1179 1180 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1181 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1182 } 1183 break; 1184 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1185 /* 1186 * We ignore this since the timer will drive out a 1187 * new cookie anyway and there timer will drive us 1188 * to send a SHUTDOWN_COMPLETE. We can't send one 1189 * here since we don't have their tag. 1190 */ 1191 break; 1192 case SCTP_CAUSE_DELETING_LAST_ADDR: 1193 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1194 case SCTP_CAUSE_DELETING_SRC_ADDR: 1195 /* 1196 * We should NOT get these here, but in a 1197 * ASCONF-ACK. 1198 */ 1199 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1200 cause_code); 1201 break; 1202 case SCTP_CAUSE_OUT_OF_RESC: 1203 /* 1204 * And what, pray tell do we do with the fact that 1205 * the peer is out of resources? Not really sure we 1206 * could do anything but abort. I suspect this 1207 * should have came WITH an abort instead of in a 1208 * OP-ERROR. 1209 */ 1210 break; 1211 default: 1212 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1213 cause_code); 1214 break; 1215 } 1216 adjust = SCTP_SIZE32(cause_length); 1217 if (remaining_length >= adjust) { 1218 remaining_length -= adjust; 1219 } else { 1220 remaining_length = 0; 1221 } 1222 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1223 } 1224 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1225 return (0); 1226 } 1227 1228 static int 1229 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1230 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1231 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1232 struct sctp_nets *net, int *abort_no_unlock, 1233 uint8_t mflowtype, uint32_t mflowid, 1234 uint32_t vrf_id) 1235 { 1236 struct sctp_init_ack *init_ack; 1237 struct mbuf *op_err; 1238 1239 SCTPDBG(SCTP_DEBUG_INPUT2, 1240 "sctp_handle_init_ack: handling INIT-ACK\n"); 1241 1242 if (stcb == NULL) { 1243 SCTPDBG(SCTP_DEBUG_INPUT2, 1244 "sctp_handle_init_ack: TCB is null\n"); 1245 return (-1); 1246 } 1247 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1248 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1249 init_ack = &cp->init; 1250 /* Validate parameters. */ 1251 if ((ntohl(init_ack->initiate_tag) == 0) || 1252 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1253 (ntohs(init_ack->num_inbound_streams) == 0) || 1254 (ntohs(init_ack->num_outbound_streams) == 0)) { 1255 /* One of the mandatory parameters is illegal. */ 1256 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1257 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1258 src, dst, sh, op_err, 1259 mflowtype, mflowid, 1260 vrf_id, net->port); 1261 *abort_no_unlock = 1; 1262 return (-1); 1263 } 1264 if (stcb->asoc.primary_destination->dest_state & 1265 SCTP_ADDR_UNCONFIRMED) { 1266 /* 1267 * The primary is where we sent the INIT, we can 1268 * always consider it confirmed when the INIT-ACK is 1269 * returned. Do this before we load addresses 1270 * though. 1271 */ 1272 stcb->asoc.primary_destination->dest_state &= 1273 ~SCTP_ADDR_UNCONFIRMED; 1274 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1275 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1276 } 1277 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1278 net, abort_no_unlock, 1279 mflowtype, mflowid, 1280 vrf_id) < 0) { 1281 /* error in parsing parameters */ 1282 return (-1); 1283 } 1284 /* Update our state. */ 1285 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1286 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1287 1288 /* Reset the RTO calculation. */ 1289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1290 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1291 stcb->asoc.overall_error_count, 1292 0, 1293 SCTP_FROM_SCTP_INPUT, 1294 __LINE__); 1295 } 1296 stcb->asoc.overall_error_count = 0; 1297 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1298 /* 1299 * Collapse the init timer back in case of a exponential 1300 * backoff. 1301 */ 1302 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1303 stcb, net); 1304 /* 1305 * The output routine at the end of the inbound data 1306 * processing will cause the cookie to be sent. 1307 */ 1308 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1309 return (0); 1310 } else { 1311 return (-1); 1312 } 1313 } 1314 1315 static struct sctp_tcb * 1316 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1317 struct sockaddr *src, struct sockaddr *dst, 1318 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1319 struct sctp_inpcb *inp, struct sctp_nets **netp, 1320 struct sockaddr *init_src, int *notification, 1321 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1322 uint8_t mflowtype, uint32_t mflowid, 1323 uint32_t vrf_id, uint16_t port); 1324 1325 /* 1326 * handle a state cookie for an existing association m: input packet mbuf 1327 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1328 * "split" mbuf and the cookie signature does not exist offset: offset into 1329 * mbuf to the cookie-echo chunk 1330 */ 1331 static struct sctp_tcb * 1332 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1333 struct sockaddr *src, struct sockaddr *dst, 1334 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1335 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1336 struct sockaddr *init_src, int *notification, 1337 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1338 uint8_t mflowtype, uint32_t mflowid, 1339 uint32_t vrf_id, uint16_t port) 1340 { 1341 struct sctp_association *asoc; 1342 struct sctp_init_chunk *init_cp, init_buf; 1343 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1344 struct sctp_asconf_addr *aparam, *naparam; 1345 struct sctp_asconf_ack *aack, *naack; 1346 struct sctp_tmit_chunk *chk, *nchk; 1347 struct sctp_stream_reset_list *strrst, *nstrrst; 1348 struct sctp_queued_to_read *sq, *nsq; 1349 struct sctp_nets *net; 1350 struct mbuf *op_err; 1351 struct timeval old; 1352 int init_offset, initack_offset, i; 1353 int retval; 1354 int spec_flag = 0; 1355 uint32_t how_indx; 1356 #if defined(SCTP_DETAILED_STR_STATS) 1357 int j; 1358 #endif 1359 1360 net = *netp; 1361 /* I know that the TCB is non-NULL from the caller */ 1362 asoc = &stcb->asoc; 1363 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1364 if (asoc->cookie_how[how_indx] == 0) 1365 break; 1366 } 1367 if (how_indx < sizeof(asoc->cookie_how)) { 1368 asoc->cookie_how[how_indx] = 1; 1369 } 1370 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1371 /* SHUTDOWN came in after sending INIT-ACK */ 1372 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1373 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1374 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1375 mflowtype, mflowid, inp->fibnum, 1376 vrf_id, net->port); 1377 if (how_indx < sizeof(asoc->cookie_how)) 1378 asoc->cookie_how[how_indx] = 2; 1379 SCTP_TCB_UNLOCK(stcb); 1380 return (NULL); 1381 } 1382 /* 1383 * find and validate the INIT chunk in the cookie (peer's info) the 1384 * INIT should start after the cookie-echo header struct (chunk 1385 * header, state cookie header struct) 1386 */ 1387 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1388 1389 init_cp = (struct sctp_init_chunk *) 1390 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1391 (uint8_t *)&init_buf); 1392 if (init_cp == NULL) { 1393 /* could not pull a INIT chunk in cookie */ 1394 SCTP_TCB_UNLOCK(stcb); 1395 return (NULL); 1396 } 1397 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1398 SCTP_TCB_UNLOCK(stcb); 1399 return (NULL); 1400 } 1401 /* 1402 * find and validate the INIT-ACK chunk in the cookie (my info) the 1403 * INIT-ACK follows the INIT chunk 1404 */ 1405 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1406 initack_cp = (struct sctp_init_ack_chunk *) 1407 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1408 (uint8_t *)&initack_buf); 1409 if (initack_cp == NULL) { 1410 /* could not pull INIT-ACK chunk in cookie */ 1411 SCTP_TCB_UNLOCK(stcb); 1412 return (NULL); 1413 } 1414 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1415 SCTP_TCB_UNLOCK(stcb); 1416 return (NULL); 1417 } 1418 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1419 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1420 /* 1421 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1422 * to get into the OPEN state 1423 */ 1424 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1425 /*- 1426 * Opps, this means that we somehow generated two vtag's 1427 * the same. I.e. we did: 1428 * Us Peer 1429 * <---INIT(tag=a)------ 1430 * ----INIT-ACK(tag=t)--> 1431 * ----INIT(tag=t)------> *1 1432 * <---INIT-ACK(tag=a)--- 1433 * <----CE(tag=t)------------- *2 1434 * 1435 * At point *1 we should be generating a different 1436 * tag t'. Which means we would throw away the CE and send 1437 * ours instead. Basically this is case C (throw away side). 1438 */ 1439 if (how_indx < sizeof(asoc->cookie_how)) 1440 asoc->cookie_how[how_indx] = 17; 1441 SCTP_TCB_UNLOCK(stcb); 1442 return (NULL); 1443 } 1444 switch (SCTP_GET_STATE(stcb)) { 1445 case SCTP_STATE_COOKIE_WAIT: 1446 case SCTP_STATE_COOKIE_ECHOED: 1447 /* 1448 * INIT was sent but got a COOKIE_ECHO with the 1449 * correct tags... just accept it...but we must 1450 * process the init so that we can make sure we have 1451 * the right seq no's. 1452 */ 1453 /* First we must process the INIT !! */ 1454 if (sctp_process_init(init_cp, stcb) < 0) { 1455 if (how_indx < sizeof(asoc->cookie_how)) 1456 asoc->cookie_how[how_indx] = 3; 1457 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1458 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1459 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1460 src, dst, sh, op_err, 1461 mflowtype, mflowid, 1462 vrf_id, net->port); 1463 return (NULL); 1464 } 1465 /* we have already processed the INIT so no problem */ 1466 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1467 stcb, net, 1468 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1469 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1470 stcb, net, 1471 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1472 /* update current state */ 1473 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1474 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1475 else 1476 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1477 1478 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1479 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1480 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1481 stcb->sctp_ep, stcb, NULL); 1482 } 1483 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1484 sctp_stop_all_cookie_timers(stcb); 1485 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1486 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1487 (!SCTP_IS_LISTENING(inp))) { 1488 /* 1489 * Here is where collision would go if we 1490 * did a connect() and instead got a 1491 * init/init-ack/cookie done before the 1492 * init-ack came back.. 1493 */ 1494 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1495 soisconnected(stcb->sctp_socket); 1496 } 1497 /* notify upper layer */ 1498 *notification = SCTP_NOTIFY_ASSOC_UP; 1499 /* 1500 * since we did not send a HB make sure we don't 1501 * double things 1502 */ 1503 old.tv_sec = cookie->time_entered.tv_sec; 1504 old.tv_usec = cookie->time_entered.tv_usec; 1505 net->hb_responded = 1; 1506 sctp_calculate_rto(stcb, asoc, net, &old, 1507 SCTP_RTT_FROM_NON_DATA); 1508 1509 if (stcb->asoc.sctp_autoclose_ticks && 1510 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1511 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1512 inp, stcb, NULL); 1513 } 1514 break; 1515 default: 1516 /* 1517 * we're in the OPEN state (or beyond), so peer must 1518 * have simply lost the COOKIE-ACK 1519 */ 1520 break; 1521 } /* end switch */ 1522 sctp_stop_all_cookie_timers(stcb); 1523 if ((retval = sctp_load_addresses_from_init(stcb, m, 1524 init_offset + sizeof(struct sctp_init_chunk), 1525 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1526 if (how_indx < sizeof(asoc->cookie_how)) 1527 asoc->cookie_how[how_indx] = 4; 1528 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1529 "Problem with address parameters"); 1530 SCTPDBG(SCTP_DEBUG_INPUT1, 1531 "Load addresses from INIT causes an abort %d\n", 1532 retval); 1533 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1534 src, dst, sh, op_err, 1535 mflowtype, mflowid, 1536 vrf_id, net->port); 1537 return (NULL); 1538 } 1539 /* respond with a COOKIE-ACK */ 1540 sctp_toss_old_cookies(stcb, asoc); 1541 sctp_send_cookie_ack(stcb); 1542 if (how_indx < sizeof(asoc->cookie_how)) 1543 asoc->cookie_how[how_indx] = 5; 1544 return (stcb); 1545 } 1546 1547 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1548 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1549 cookie->tie_tag_my_vtag == 0 && 1550 cookie->tie_tag_peer_vtag == 0) { 1551 /* 1552 * case C in Section 5.2.4 Table 2: XMOO silently discard 1553 */ 1554 if (how_indx < sizeof(asoc->cookie_how)) 1555 asoc->cookie_how[how_indx] = 6; 1556 SCTP_TCB_UNLOCK(stcb); 1557 return (NULL); 1558 } 1559 /* 1560 * If nat support, and the below and stcb is established, send back 1561 * a ABORT(colliding state) if we are established. 1562 */ 1563 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1564 (asoc->peer_supports_nat) && 1565 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1566 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1567 (asoc->peer_vtag == 0)))) { 1568 /* 1569 * Special case - Peer's support nat. We may have two init's 1570 * that we gave out the same tag on since one was not 1571 * established.. i.e. we get INIT from host-1 behind the nat 1572 * and we respond tag-a, we get a INIT from host-2 behind 1573 * the nat and we get tag-a again. Then we bring up host-1 1574 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1575 * Now we have colliding state. We must send an abort here 1576 * with colliding state indication. 1577 */ 1578 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1579 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1580 mflowtype, mflowid, inp->fibnum, 1581 vrf_id, port); 1582 SCTP_TCB_UNLOCK(stcb); 1583 return (NULL); 1584 } 1585 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1586 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1587 (asoc->peer_vtag == 0))) { 1588 /* 1589 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1590 * should be ok, re-accept peer info 1591 */ 1592 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1593 /* 1594 * Extension of case C. If we hit this, then the 1595 * random number generator returned the same vtag 1596 * when we first sent our INIT-ACK and when we later 1597 * sent our INIT. The side with the seq numbers that 1598 * are different will be the one that normally would 1599 * have hit case C. This in effect "extends" our 1600 * vtags in this collision case to be 64 bits. The 1601 * same collision could occur aka you get both vtag 1602 * and seq number the same twice in a row.. but is 1603 * much less likely. If it did happen then we would 1604 * proceed through and bring up the assoc.. we may 1605 * end up with the wrong stream setup however.. 1606 * which would be bad.. but there is no way to 1607 * tell.. until we send on a stream that does not 1608 * exist :-) 1609 */ 1610 if (how_indx < sizeof(asoc->cookie_how)) 1611 asoc->cookie_how[how_indx] = 7; 1612 1613 SCTP_TCB_UNLOCK(stcb); 1614 return (NULL); 1615 } 1616 if (how_indx < sizeof(asoc->cookie_how)) 1617 asoc->cookie_how[how_indx] = 8; 1618 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1619 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1620 sctp_stop_all_cookie_timers(stcb); 1621 /* 1622 * since we did not send a HB make sure we don't double 1623 * things 1624 */ 1625 net->hb_responded = 1; 1626 if (stcb->asoc.sctp_autoclose_ticks && 1627 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1628 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1629 NULL); 1630 } 1631 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1632 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1633 asoc->pre_open_streams = asoc->streamoutcnt; 1634 } 1635 1636 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1637 /* 1638 * Ok the peer probably discarded our data (if we 1639 * echoed a cookie+data). So anything on the 1640 * sent_queue should be marked for retransmit, we 1641 * may not get something to kick us so it COULD 1642 * still take a timeout to move these.. but it can't 1643 * hurt to mark them. 1644 */ 1645 1646 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1647 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1648 chk->sent = SCTP_DATAGRAM_RESEND; 1649 sctp_flight_size_decrease(chk); 1650 sctp_total_flight_decrease(stcb, chk); 1651 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1652 spec_flag++; 1653 } 1654 } 1655 } 1656 /* process the INIT info (peer's info) */ 1657 if (sctp_process_init(init_cp, stcb) < 0) { 1658 if (how_indx < sizeof(asoc->cookie_how)) 1659 asoc->cookie_how[how_indx] = 9; 1660 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1661 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1662 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1663 src, dst, sh, op_err, 1664 mflowtype, mflowid, 1665 vrf_id, net->port); 1666 return (NULL); 1667 } 1668 if ((retval = sctp_load_addresses_from_init(stcb, m, 1669 init_offset + sizeof(struct sctp_init_chunk), 1670 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1671 if (how_indx < sizeof(asoc->cookie_how)) 1672 asoc->cookie_how[how_indx] = 10; 1673 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1674 "Problem with address parameters"); 1675 SCTPDBG(SCTP_DEBUG_INPUT1, 1676 "Load addresses from INIT causes an abort %d\n", 1677 retval); 1678 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1679 src, dst, sh, op_err, 1680 mflowtype, mflowid, 1681 vrf_id, net->port); 1682 return (NULL); 1683 } 1684 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1685 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1686 *notification = SCTP_NOTIFY_ASSOC_UP; 1687 1688 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1689 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1690 (!SCTP_IS_LISTENING(inp))) { 1691 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1692 soisconnected(stcb->sctp_socket); 1693 } 1694 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1695 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1696 else 1697 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1698 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1699 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1700 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1701 } else { 1702 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1703 } 1704 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1705 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1706 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1707 stcb->sctp_ep, stcb, NULL); 1708 } 1709 sctp_stop_all_cookie_timers(stcb); 1710 sctp_toss_old_cookies(stcb, asoc); 1711 sctp_send_cookie_ack(stcb); 1712 if (spec_flag) { 1713 /* 1714 * only if we have retrans set do we do this. What 1715 * this call does is get only the COOKIE-ACK out and 1716 * then when we return the normal call to 1717 * sctp_chunk_output will get the retrans out behind 1718 * this. 1719 */ 1720 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1721 } 1722 if (how_indx < sizeof(asoc->cookie_how)) 1723 asoc->cookie_how[how_indx] = 11; 1724 1725 return (stcb); 1726 } 1727 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1728 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1729 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1730 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1731 cookie->tie_tag_peer_vtag != 0) { 1732 struct sctpasochead *head; 1733 1734 if (asoc->peer_supports_nat) { 1735 struct sctp_tcb *local_stcb; 1736 1737 /* 1738 * This is a gross gross hack. Just call the 1739 * cookie_new code since we are allowing a duplicate 1740 * association. I hope this works... 1741 */ 1742 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1743 sh, cookie, cookie_len, 1744 inp, netp, init_src, notification, 1745 auth_skipped, auth_offset, auth_len, 1746 mflowtype, mflowid, 1747 vrf_id, port); 1748 if (local_stcb == NULL) { 1749 SCTP_TCB_UNLOCK(stcb); 1750 } 1751 return (local_stcb); 1752 } 1753 /* 1754 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1755 */ 1756 /* temp code */ 1757 if (how_indx < sizeof(asoc->cookie_how)) 1758 asoc->cookie_how[how_indx] = 12; 1759 sctp_stop_association_timers(stcb, false); 1760 /* notify upper layer */ 1761 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1762 atomic_add_int(&stcb->asoc.refcnt, 1); 1763 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1764 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1765 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1766 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1767 } 1768 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1769 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1770 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1771 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1772 } 1773 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1774 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1775 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1776 stcb->sctp_ep, stcb, NULL); 1777 1778 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1779 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1780 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1781 } 1782 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1783 asoc->pre_open_streams = asoc->streamoutcnt; 1784 } 1785 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1786 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1787 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1788 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1789 asoc->str_reset_seq_in = asoc->init_seq_number; 1790 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1791 asoc->send_sack = 1; 1792 asoc->data_pkts_seen = 0; 1793 asoc->last_data_chunk_from = NULL; 1794 asoc->last_control_chunk_from = NULL; 1795 asoc->last_net_cmt_send_started = NULL; 1796 if (asoc->mapping_array) { 1797 memset(asoc->mapping_array, 0, 1798 asoc->mapping_array_size); 1799 } 1800 if (asoc->nr_mapping_array) { 1801 memset(asoc->nr_mapping_array, 0, 1802 asoc->mapping_array_size); 1803 } 1804 SCTP_TCB_UNLOCK(stcb); 1805 SCTP_INP_INFO_WLOCK(); 1806 SCTP_INP_WLOCK(stcb->sctp_ep); 1807 SCTP_TCB_LOCK(stcb); 1808 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1809 /* send up all the data */ 1810 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1811 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1812 stcb->asoc.strmout[i].chunks_on_queues = 0; 1813 #if defined(SCTP_DETAILED_STR_STATS) 1814 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1815 asoc->strmout[i].abandoned_sent[j] = 0; 1816 asoc->strmout[i].abandoned_unsent[j] = 0; 1817 } 1818 #else 1819 asoc->strmout[i].abandoned_sent[0] = 0; 1820 asoc->strmout[i].abandoned_unsent[0] = 0; 1821 #endif 1822 stcb->asoc.strmout[i].next_mid_ordered = 0; 1823 stcb->asoc.strmout[i].next_mid_unordered = 0; 1824 stcb->asoc.strmout[i].sid = i; 1825 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1826 } 1827 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1828 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1829 SCTP_FREE(strrst, SCTP_M_STRESET); 1830 } 1831 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1832 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1833 if (sq->data) { 1834 sctp_m_freem(sq->data); 1835 sq->data = NULL; 1836 } 1837 sctp_free_remote_addr(sq->whoFrom); 1838 sq->whoFrom = NULL; 1839 sq->stcb = NULL; 1840 sctp_free_a_readq(stcb, sq); 1841 } 1842 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1843 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1844 if (chk->data) { 1845 sctp_m_freem(chk->data); 1846 chk->data = NULL; 1847 } 1848 if (chk->holds_key_ref) 1849 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1850 sctp_free_remote_addr(chk->whoTo); 1851 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1852 SCTP_DECR_CHK_COUNT(); 1853 } 1854 asoc->ctrl_queue_cnt = 0; 1855 asoc->str_reset = NULL; 1856 asoc->stream_reset_outstanding = 0; 1857 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1858 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1859 if (chk->data) { 1860 sctp_m_freem(chk->data); 1861 chk->data = NULL; 1862 } 1863 if (chk->holds_key_ref) 1864 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1865 sctp_free_remote_addr(chk->whoTo); 1866 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1867 SCTP_DECR_CHK_COUNT(); 1868 } 1869 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1870 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1871 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1872 } 1873 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1874 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1875 if (aack->data != NULL) { 1876 sctp_m_freem(aack->data); 1877 } 1878 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1879 } 1880 1881 /* process the INIT-ACK info (my info) */ 1882 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1883 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1884 1885 /* pull from vtag hash */ 1886 LIST_REMOVE(stcb, sctp_asocs); 1887 /* re-insert to new vtag position */ 1888 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1889 SCTP_BASE_INFO(hashasocmark))]; 1890 /* 1891 * put it in the bucket in the vtag hash of assoc's for the 1892 * system 1893 */ 1894 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1895 1896 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1897 SCTP_INP_INFO_WUNLOCK(); 1898 asoc->total_flight = 0; 1899 asoc->total_flight_count = 0; 1900 /* process the INIT info (peer's info) */ 1901 if (sctp_process_init(init_cp, stcb) < 0) { 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 13; 1904 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1905 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1906 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1907 src, dst, sh, op_err, 1908 mflowtype, mflowid, 1909 vrf_id, net->port); 1910 return (NULL); 1911 } 1912 /* 1913 * since we did not send a HB make sure we don't double 1914 * things 1915 */ 1916 net->hb_responded = 1; 1917 1918 if ((retval = sctp_load_addresses_from_init(stcb, m, 1919 init_offset + sizeof(struct sctp_init_chunk), 1920 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1921 if (how_indx < sizeof(asoc->cookie_how)) 1922 asoc->cookie_how[how_indx] = 14; 1923 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1924 "Problem with address parameters"); 1925 SCTPDBG(SCTP_DEBUG_INPUT1, 1926 "Load addresses from INIT causes an abort %d\n", 1927 retval); 1928 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1929 src, dst, sh, op_err, 1930 mflowtype, mflowid, 1931 vrf_id, net->port); 1932 return (NULL); 1933 } 1934 /* respond with a COOKIE-ACK */ 1935 sctp_send_cookie_ack(stcb); 1936 if (how_indx < sizeof(asoc->cookie_how)) 1937 asoc->cookie_how[how_indx] = 15; 1938 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1939 (asoc->sctp_autoclose_ticks > 0)) { 1940 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1941 } 1942 return (stcb); 1943 } 1944 if (how_indx < sizeof(asoc->cookie_how)) 1945 asoc->cookie_how[how_indx] = 16; 1946 /* all other cases... */ 1947 SCTP_TCB_UNLOCK(stcb); 1948 return (NULL); 1949 } 1950 1951 /* 1952 * handle a state cookie for a new association m: input packet mbuf chain-- 1953 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1954 * and the cookie signature does not exist offset: offset into mbuf to the 1955 * cookie-echo chunk length: length of the cookie chunk to: where the init 1956 * was from returns a new TCB 1957 */ 1958 static struct sctp_tcb * 1959 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1960 struct sockaddr *src, struct sockaddr *dst, 1961 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1962 struct sctp_inpcb *inp, struct sctp_nets **netp, 1963 struct sockaddr *init_src, int *notification, 1964 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1965 uint8_t mflowtype, uint32_t mflowid, 1966 uint32_t vrf_id, uint16_t port) 1967 { 1968 struct sctp_tcb *stcb; 1969 struct sctp_init_chunk *init_cp, init_buf; 1970 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1971 union sctp_sockstore store; 1972 struct sctp_association *asoc; 1973 int init_offset, initack_offset, initack_limit; 1974 int error = 0; 1975 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1976 1977 /* 1978 * find and validate the INIT chunk in the cookie (peer's info) the 1979 * INIT should start after the cookie-echo header struct (chunk 1980 * header, state cookie header struct) 1981 */ 1982 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1983 init_cp = (struct sctp_init_chunk *) 1984 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1985 (uint8_t *)&init_buf); 1986 if (init_cp == NULL) { 1987 /* could not pull a INIT chunk in cookie */ 1988 SCTPDBG(SCTP_DEBUG_INPUT1, 1989 "process_cookie_new: could not pull INIT chunk hdr\n"); 1990 return (NULL); 1991 } 1992 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1993 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1994 return (NULL); 1995 } 1996 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1997 /* 1998 * find and validate the INIT-ACK chunk in the cookie (my info) the 1999 * INIT-ACK follows the INIT chunk 2000 */ 2001 initack_cp = (struct sctp_init_ack_chunk *) 2002 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2003 (uint8_t *)&initack_buf); 2004 if (initack_cp == NULL) { 2005 /* could not pull INIT-ACK chunk in cookie */ 2006 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2007 return (NULL); 2008 } 2009 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2010 return (NULL); 2011 } 2012 /* 2013 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2014 * "initack_limit" value. This is because the chk_length field 2015 * includes the length of the cookie, but the cookie is omitted when 2016 * the INIT and INIT_ACK are tacked onto the cookie... 2017 */ 2018 initack_limit = offset + cookie_len; 2019 2020 /* 2021 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2022 * and populate 2023 */ 2024 2025 /* 2026 * Here we do a trick, we set in NULL for the proc/thread argument. 2027 * We do this since in effect we only use the p argument when the 2028 * socket is unbound and we must do an implicit bind. Since we are 2029 * getting a cookie, we cannot be unbound. 2030 */ 2031 stcb = sctp_aloc_assoc(inp, init_src, &error, 2032 ntohl(initack_cp->init.initiate_tag), 2033 ntohl(initack_cp->init.initial_tsn), vrf_id, 2034 ntohs(initack_cp->init.num_outbound_streams), 2035 port, 2036 (struct thread *)NULL, 2037 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2038 if (stcb == NULL) { 2039 struct mbuf *op_err; 2040 2041 /* memory problem? */ 2042 SCTPDBG(SCTP_DEBUG_INPUT1, 2043 "process_cookie_new: no room for another TCB!\n"); 2044 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2045 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2046 src, dst, sh, op_err, 2047 mflowtype, mflowid, 2048 vrf_id, port); 2049 return (NULL); 2050 } 2051 asoc = &stcb->asoc; 2052 /* get scope variables out of cookie */ 2053 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2054 asoc->scope.site_scope = cookie->site_scope; 2055 asoc->scope.local_scope = cookie->local_scope; 2056 asoc->scope.loopback_scope = cookie->loopback_scope; 2057 2058 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2059 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2060 struct mbuf *op_err; 2061 2062 /* 2063 * Houston we have a problem. The EP changed while the 2064 * cookie was in flight. Only recourse is to abort the 2065 * association. 2066 */ 2067 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2068 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2069 src, dst, sh, op_err, 2070 mflowtype, mflowid, 2071 vrf_id, port); 2072 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2073 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2074 return (NULL); 2075 } 2076 /* process the INIT-ACK info (my info) */ 2077 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2078 2079 /* process the INIT info (peer's info) */ 2080 if (sctp_process_init(init_cp, stcb) < 0) { 2081 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2082 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2083 return (NULL); 2084 } 2085 /* load all addresses */ 2086 if (sctp_load_addresses_from_init(stcb, m, 2087 init_offset + sizeof(struct sctp_init_chunk), 2088 initack_offset, src, dst, init_src, port) < 0) { 2089 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2090 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2091 return (NULL); 2092 } 2093 /* 2094 * verify any preceding AUTH chunk that was skipped 2095 */ 2096 /* pull the local authentication parameters from the cookie/init-ack */ 2097 sctp_auth_get_cookie_params(stcb, m, 2098 initack_offset + sizeof(struct sctp_init_ack_chunk), 2099 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2100 if (auth_skipped) { 2101 struct sctp_auth_chunk *auth; 2102 2103 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2104 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2105 } else { 2106 auth = NULL; 2107 } 2108 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2109 /* auth HMAC failed, dump the assoc and packet */ 2110 SCTPDBG(SCTP_DEBUG_AUTH1, 2111 "COOKIE-ECHO: AUTH failed\n"); 2112 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2113 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2114 return (NULL); 2115 } else { 2116 /* remaining chunks checked... good to go */ 2117 stcb->asoc.authenticated = 1; 2118 } 2119 } 2120 2121 /* 2122 * if we're doing ASCONFs, check to see if we have any new local 2123 * addresses that need to get added to the peer (eg. addresses 2124 * changed while cookie echo in flight). This needs to be done 2125 * after we go to the OPEN state to do the correct asconf 2126 * processing. else, make sure we have the correct addresses in our 2127 * lists 2128 */ 2129 2130 /* warning, we re-use sin, sin6, sa_store here! */ 2131 /* pull in local_address (our "from" address) */ 2132 switch (cookie->laddr_type) { 2133 #ifdef INET 2134 case SCTP_IPV4_ADDRESS: 2135 /* source addr is IPv4 */ 2136 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2137 store.sin.sin_family = AF_INET; 2138 store.sin.sin_len = sizeof(struct sockaddr_in); 2139 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2140 break; 2141 #endif 2142 #ifdef INET6 2143 case SCTP_IPV6_ADDRESS: 2144 /* source addr is IPv6 */ 2145 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2146 store.sin6.sin6_family = AF_INET6; 2147 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2148 store.sin6.sin6_scope_id = cookie->scope_id; 2149 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2150 break; 2151 #endif 2152 default: 2153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2154 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2155 return (NULL); 2156 } 2157 2158 /* update current state */ 2159 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2160 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2161 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2162 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2163 stcb->sctp_ep, stcb, NULL); 2164 } 2165 sctp_stop_all_cookie_timers(stcb); 2166 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2167 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2168 2169 /* set up to notify upper layer */ 2170 *notification = SCTP_NOTIFY_ASSOC_UP; 2171 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2172 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2173 (!SCTP_IS_LISTENING(inp))) { 2174 /* 2175 * This is an endpoint that called connect() how it got a 2176 * cookie that is NEW is a bit of a mystery. It must be that 2177 * the INIT was sent, but before it got there.. a complete 2178 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2179 * should have went to the other code.. not here.. oh well.. 2180 * a bit of protection is worth having.. 2181 * 2182 * XXXMJ unlocked 2183 */ 2184 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2185 soisconnected(stcb->sctp_socket); 2186 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2187 (SCTP_IS_LISTENING(inp))) { 2188 /* 2189 * We don't want to do anything with this one. Since it is 2190 * the listening guy. The timer will get started for 2191 * accepted connections in the caller. 2192 */ 2193 ; 2194 } 2195 if (stcb->asoc.sctp_autoclose_ticks && 2196 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2197 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2198 } 2199 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2200 *netp = sctp_findnet(stcb, init_src); 2201 if (*netp != NULL) { 2202 struct timeval old; 2203 2204 /* 2205 * Since we did not send a HB, make sure we don't double 2206 * things. 2207 */ 2208 (*netp)->hb_responded = 1; 2209 /* Calculate the RTT. */ 2210 old.tv_sec = cookie->time_entered.tv_sec; 2211 old.tv_usec = cookie->time_entered.tv_usec; 2212 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2213 } 2214 /* respond with a COOKIE-ACK */ 2215 sctp_send_cookie_ack(stcb); 2216 2217 /* 2218 * check the address lists for any ASCONFs that need to be sent 2219 * AFTER the cookie-ack is sent 2220 */ 2221 sctp_check_address_list(stcb, m, 2222 initack_offset + sizeof(struct sctp_init_ack_chunk), 2223 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2224 &store.sa, cookie->local_scope, cookie->site_scope, 2225 cookie->ipv4_scope, cookie->loopback_scope); 2226 2227 return (stcb); 2228 } 2229 2230 /* 2231 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2232 * we NEED to make sure we are not already using the vtag. If so we 2233 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2234 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2235 SCTP_BASE_INFO(hashasocmark))]; 2236 LIST_FOREACH(stcb, head, sctp_asocs) { 2237 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2238 -- SEND ABORT - TRY AGAIN -- 2239 } 2240 } 2241 */ 2242 2243 /* 2244 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2245 * existing (non-NULL) TCB 2246 */ 2247 static struct mbuf * 2248 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2249 struct sockaddr *src, struct sockaddr *dst, 2250 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2251 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2252 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2253 struct sctp_tcb **locked_tcb, 2254 uint8_t mflowtype, uint32_t mflowid, 2255 uint32_t vrf_id, uint16_t port) 2256 { 2257 struct sctp_state_cookie *cookie; 2258 struct sctp_tcb *l_stcb = *stcb; 2259 struct sctp_inpcb *l_inp; 2260 struct sockaddr *to; 2261 struct sctp_pcb *ep; 2262 struct mbuf *m_sig; 2263 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2264 uint8_t *sig; 2265 uint8_t cookie_ok = 0; 2266 unsigned int sig_offset, cookie_offset; 2267 unsigned int cookie_len; 2268 struct timeval now; 2269 struct timeval time_entered, time_expires; 2270 int notification = 0; 2271 struct sctp_nets *netl; 2272 int had_a_existing_tcb = 0; 2273 int send_int_conf = 0; 2274 #ifdef INET 2275 struct sockaddr_in sin; 2276 #endif 2277 #ifdef INET6 2278 struct sockaddr_in6 sin6; 2279 #endif 2280 2281 SCTPDBG(SCTP_DEBUG_INPUT2, 2282 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2283 2284 if (inp_p == NULL) { 2285 return (NULL); 2286 } 2287 cookie = &cp->cookie; 2288 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2289 cookie_len = ntohs(cp->ch.chunk_length); 2290 2291 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2292 sizeof(struct sctp_init_chunk) + 2293 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2294 /* cookie too small */ 2295 return (NULL); 2296 } 2297 if ((cookie->peerport != sh->src_port) || 2298 (cookie->myport != sh->dest_port) || 2299 (cookie->my_vtag != sh->v_tag)) { 2300 /* 2301 * invalid ports or bad tag. Note that we always leave the 2302 * v_tag in the header in network order and when we stored 2303 * it in the my_vtag slot we also left it in network order. 2304 * This maintains the match even though it may be in the 2305 * opposite byte order of the machine :-> 2306 */ 2307 return (NULL); 2308 } 2309 /* 2310 * split off the signature into its own mbuf (since it should not be 2311 * calculated in the sctp_hmac_m() call). 2312 */ 2313 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2314 m_sig = m_split(m, sig_offset, M_NOWAIT); 2315 if (m_sig == NULL) { 2316 /* out of memory or ?? */ 2317 return (NULL); 2318 } 2319 #ifdef SCTP_MBUF_LOGGING 2320 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2321 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2322 } 2323 #endif 2324 2325 /* 2326 * compute the signature/digest for the cookie 2327 */ 2328 if (l_stcb != NULL) { 2329 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2330 SCTP_TCB_UNLOCK(l_stcb); 2331 } 2332 l_inp = *inp_p; 2333 SCTP_INP_RLOCK(l_inp); 2334 if (l_stcb != NULL) { 2335 SCTP_TCB_LOCK(l_stcb); 2336 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2337 } 2338 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2339 SCTP_INP_RUNLOCK(l_inp); 2340 sctp_m_freem(m_sig); 2341 return (NULL); 2342 } 2343 ep = &(*inp_p)->sctp_ep; 2344 /* which cookie is it? */ 2345 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2346 (ep->current_secret_number != ep->last_secret_number)) { 2347 /* it's the old cookie */ 2348 (void)sctp_hmac_m(SCTP_HMAC, 2349 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2350 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2351 } else { 2352 /* it's the current cookie */ 2353 (void)sctp_hmac_m(SCTP_HMAC, 2354 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2355 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2356 } 2357 /* get the signature */ 2358 SCTP_INP_RUNLOCK(l_inp); 2359 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2360 if (sig == NULL) { 2361 /* couldn't find signature */ 2362 sctp_m_freem(m_sig); 2363 return (NULL); 2364 } 2365 /* compare the received digest with the computed digest */ 2366 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2367 /* try the old cookie? */ 2368 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2369 (ep->current_secret_number != ep->last_secret_number)) { 2370 /* compute digest with old */ 2371 (void)sctp_hmac_m(SCTP_HMAC, 2372 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2373 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2374 /* compare */ 2375 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2376 cookie_ok = 1; 2377 } 2378 } else { 2379 cookie_ok = 1; 2380 } 2381 2382 /* 2383 * Now before we continue we must reconstruct our mbuf so that 2384 * normal processing of any other chunks will work. 2385 */ 2386 { 2387 struct mbuf *m_at; 2388 2389 m_at = m; 2390 while (SCTP_BUF_NEXT(m_at) != NULL) { 2391 m_at = SCTP_BUF_NEXT(m_at); 2392 } 2393 SCTP_BUF_NEXT(m_at) = m_sig; 2394 } 2395 2396 if (cookie_ok == 0) { 2397 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2398 SCTPDBG(SCTP_DEBUG_INPUT2, 2399 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2400 (uint32_t)offset, cookie_offset, sig_offset); 2401 return (NULL); 2402 } 2403 2404 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2405 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2406 return (NULL); 2407 } 2408 time_entered.tv_sec = cookie->time_entered.tv_sec; 2409 time_entered.tv_usec = cookie->time_entered.tv_usec; 2410 if ((time_entered.tv_sec < 0) || 2411 (time_entered.tv_usec < 0) || 2412 (time_entered.tv_usec >= 1000000)) { 2413 /* Invalid time stamp. Cookie must have been modified. */ 2414 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2415 return (NULL); 2416 } 2417 (void)SCTP_GETTIME_TIMEVAL(&now); 2418 if (timevalcmp(&now, &time_entered, <)) { 2419 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2420 return (NULL); 2421 } 2422 /* 2423 * Check the cookie timestamps to be sure it's not stale. 2424 * cookie_life is in ticks, so we convert to seconds. 2425 */ 2426 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2427 time_expires.tv_usec = time_entered.tv_usec; 2428 if (timevalcmp(&now, &time_expires, >)) { 2429 /* cookie is stale! */ 2430 struct mbuf *op_err; 2431 struct sctp_error_stale_cookie *cause; 2432 struct timeval diff; 2433 uint32_t staleness; 2434 2435 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2436 0, M_NOWAIT, 1, MT_DATA); 2437 if (op_err == NULL) { 2438 /* FOOBAR */ 2439 return (NULL); 2440 } 2441 /* Set the len */ 2442 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2443 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2444 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2445 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2446 diff = now; 2447 timevalsub(&diff, &time_expires); 2448 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2449 staleness = UINT32_MAX; 2450 } else { 2451 staleness = (uint32_t)diff.tv_sec * 1000000; 2452 } 2453 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2454 staleness += (uint32_t)diff.tv_usec; 2455 } else { 2456 staleness = UINT32_MAX; 2457 } 2458 cause->stale_time = htonl(staleness); 2459 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2460 mflowtype, mflowid, l_inp->fibnum, 2461 vrf_id, port); 2462 return (NULL); 2463 } 2464 /* 2465 * Now we must see with the lookup address if we have an existing 2466 * asoc. This will only happen if we were in the COOKIE-WAIT state 2467 * and a INIT collided with us and somewhere the peer sent the 2468 * cookie on another address besides the single address our assoc 2469 * had for him. In this case we will have one of the tie-tags set at 2470 * least AND the address field in the cookie can be used to look it 2471 * up. 2472 */ 2473 to = NULL; 2474 switch (cookie->addr_type) { 2475 #ifdef INET6 2476 case SCTP_IPV6_ADDRESS: 2477 memset(&sin6, 0, sizeof(sin6)); 2478 sin6.sin6_family = AF_INET6; 2479 sin6.sin6_len = sizeof(sin6); 2480 sin6.sin6_port = sh->src_port; 2481 sin6.sin6_scope_id = cookie->scope_id; 2482 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2483 sizeof(sin6.sin6_addr.s6_addr)); 2484 to = (struct sockaddr *)&sin6; 2485 break; 2486 #endif 2487 #ifdef INET 2488 case SCTP_IPV4_ADDRESS: 2489 memset(&sin, 0, sizeof(sin)); 2490 sin.sin_family = AF_INET; 2491 sin.sin_len = sizeof(sin); 2492 sin.sin_port = sh->src_port; 2493 sin.sin_addr.s_addr = cookie->address[0]; 2494 to = (struct sockaddr *)&sin; 2495 break; 2496 #endif 2497 default: 2498 /* This should not happen */ 2499 return (NULL); 2500 } 2501 if (*stcb == NULL) { 2502 /* Yep, lets check */ 2503 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2504 if (*stcb == NULL) { 2505 /* 2506 * We should have only got back the same inp. If we 2507 * got back a different ep we have a problem. The 2508 * original findep got back l_inp and now 2509 */ 2510 if (l_inp != *inp_p) { 2511 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2512 } 2513 } else { 2514 if (*locked_tcb == NULL) { 2515 /* 2516 * In this case we found the assoc only 2517 * after we locked the create lock. This 2518 * means we are in a colliding case and we 2519 * must make sure that we unlock the tcb if 2520 * its one of the cases where we throw away 2521 * the incoming packets. 2522 */ 2523 *locked_tcb = *stcb; 2524 2525 /* 2526 * We must also increment the inp ref count 2527 * since the ref_count flags was set when we 2528 * did not find the TCB, now we found it 2529 * which reduces the refcount.. we must 2530 * raise it back out to balance it all :-) 2531 */ 2532 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2533 if ((*stcb)->sctp_ep != l_inp) { 2534 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2535 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2536 } 2537 } 2538 } 2539 } 2540 2541 cookie_len -= SCTP_SIGNATURE_SIZE; 2542 if (*stcb == NULL) { 2543 /* this is the "normal" case... get a new TCB */ 2544 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2545 cookie, cookie_len, *inp_p, 2546 netp, to, ¬ification, 2547 auth_skipped, auth_offset, auth_len, 2548 mflowtype, mflowid, 2549 vrf_id, port); 2550 } else { 2551 /* this is abnormal... cookie-echo on existing TCB */ 2552 had_a_existing_tcb = 1; 2553 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2554 src, dst, sh, 2555 cookie, cookie_len, *inp_p, *stcb, netp, to, 2556 ¬ification, auth_skipped, auth_offset, auth_len, 2557 mflowtype, mflowid, 2558 vrf_id, port); 2559 if (*stcb == NULL) { 2560 *locked_tcb = NULL; 2561 } 2562 } 2563 2564 if (*stcb == NULL) { 2565 /* still no TCB... must be bad cookie-echo */ 2566 return (NULL); 2567 } 2568 if (*netp != NULL) { 2569 (*netp)->flowtype = mflowtype; 2570 (*netp)->flowid = mflowid; 2571 } 2572 /* 2573 * Ok, we built an association so confirm the address we sent the 2574 * INIT-ACK to. 2575 */ 2576 netl = sctp_findnet(*stcb, to); 2577 /* 2578 * This code should in theory NOT run but 2579 */ 2580 if (netl == NULL) { 2581 /* TSNH! Huh, why do I need to add this address here? */ 2582 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2583 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2584 return (NULL); 2585 } 2586 netl = sctp_findnet(*stcb, to); 2587 } 2588 if (netl) { 2589 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2590 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2591 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2592 netl); 2593 send_int_conf = 1; 2594 } 2595 } 2596 sctp_start_net_timers(*stcb); 2597 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2598 if (!had_a_existing_tcb || 2599 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2600 /* 2601 * If we have a NEW cookie or the connect never 2602 * reached the connected state during collision we 2603 * must do the TCP accept thing. 2604 */ 2605 struct socket *so, *oso; 2606 struct sctp_inpcb *inp; 2607 2608 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2609 /* 2610 * For a restart we will keep the same 2611 * socket, no need to do anything. I THINK!! 2612 */ 2613 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2614 if (send_int_conf) { 2615 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2616 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2617 } 2618 return (m); 2619 } 2620 oso = (*inp_p)->sctp_socket; 2621 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2622 SCTP_TCB_UNLOCK((*stcb)); 2623 CURVNET_SET(oso->so_vnet); 2624 so = sonewconn(oso, 0 2625 ); 2626 CURVNET_RESTORE(); 2627 SCTP_TCB_LOCK((*stcb)); 2628 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2629 2630 if (so == NULL) { 2631 struct mbuf *op_err; 2632 2633 /* Too many sockets */ 2634 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2635 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2636 sctp_abort_association(*inp_p, NULL, m, iphlen, 2637 src, dst, sh, op_err, 2638 mflowtype, mflowid, 2639 vrf_id, port); 2640 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2641 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2642 return (NULL); 2643 } 2644 inp = (struct sctp_inpcb *)so->so_pcb; 2645 SCTP_INP_INCR_REF(inp); 2646 /* 2647 * We add the unbound flag here so that if we get an 2648 * soabort() before we get the move_pcb done, we 2649 * will properly cleanup. 2650 */ 2651 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2652 SCTP_PCB_FLAGS_CONNECTED | 2653 SCTP_PCB_FLAGS_IN_TCPPOOL | 2654 SCTP_PCB_FLAGS_UNBOUND | 2655 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2656 SCTP_PCB_FLAGS_DONT_WAKE); 2657 inp->sctp_features = (*inp_p)->sctp_features; 2658 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2659 inp->sctp_socket = so; 2660 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2661 inp->max_cwnd = (*inp_p)->max_cwnd; 2662 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2663 inp->ecn_supported = (*inp_p)->ecn_supported; 2664 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2665 inp->auth_supported = (*inp_p)->auth_supported; 2666 inp->asconf_supported = (*inp_p)->asconf_supported; 2667 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2668 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2669 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2670 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2671 inp->sctp_context = (*inp_p)->sctp_context; 2672 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2673 inp->fibnum = (*inp_p)->fibnum; 2674 /* 2675 * copy in the authentication parameters from the 2676 * original endpoint 2677 */ 2678 if (inp->sctp_ep.local_hmacs) 2679 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2680 inp->sctp_ep.local_hmacs = 2681 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2682 if (inp->sctp_ep.local_auth_chunks) 2683 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2684 inp->sctp_ep.local_auth_chunks = 2685 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2686 2687 /* 2688 * Now we must move it from one hash table to 2689 * another and get the tcb in the right place. 2690 */ 2691 2692 /* 2693 * This is where the one-2-one socket is put into 2694 * the accept state waiting for the accept! 2695 */ 2696 if (*stcb) { 2697 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2698 } 2699 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2700 2701 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2702 SCTP_TCB_UNLOCK((*stcb)); 2703 2704 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2705 0); 2706 SCTP_TCB_LOCK((*stcb)); 2707 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2708 2709 /* 2710 * now we must check to see if we were aborted while 2711 * the move was going on and the lock/unlock 2712 * happened. 2713 */ 2714 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2715 /* 2716 * yep it was, we leave the assoc attached 2717 * to the socket since the sctp_inpcb_free() 2718 * call will send an abort for us. 2719 */ 2720 SCTP_INP_DECR_REF(inp); 2721 return (NULL); 2722 } 2723 SCTP_INP_DECR_REF(inp); 2724 /* Switch over to the new guy */ 2725 *inp_p = inp; 2726 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2727 if (send_int_conf) { 2728 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2729 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2730 } 2731 2732 /* 2733 * Pull it from the incomplete queue and wake the 2734 * guy 2735 */ 2736 soisconnected(so); 2737 return (m); 2738 } 2739 } 2740 if (notification) { 2741 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2742 } 2743 if (send_int_conf) { 2744 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2745 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2746 } 2747 return (m); 2748 } 2749 2750 static void 2751 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2752 struct sctp_tcb *stcb, struct sctp_nets *net) 2753 { 2754 /* cp must not be used, others call this without a c-ack :-) */ 2755 struct sctp_association *asoc; 2756 struct sctp_tmit_chunk *chk; 2757 2758 SCTPDBG(SCTP_DEBUG_INPUT2, 2759 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2760 if ((stcb == NULL) || (net == NULL)) { 2761 return; 2762 } 2763 2764 asoc = &stcb->asoc; 2765 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2766 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2767 asoc->overall_error_count, 2768 0, 2769 SCTP_FROM_SCTP_INPUT, 2770 __LINE__); 2771 } 2772 asoc->overall_error_count = 0; 2773 sctp_stop_all_cookie_timers(stcb); 2774 /* process according to association state */ 2775 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2776 /* state change only needed when I am in right state */ 2777 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2778 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2779 sctp_start_net_timers(stcb); 2780 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2781 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2782 stcb->sctp_ep, stcb, NULL); 2783 } 2784 /* update RTO */ 2785 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2786 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2787 if (asoc->overall_error_count == 0) { 2788 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2789 SCTP_RTT_FROM_NON_DATA); 2790 } 2791 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2792 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2793 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2794 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2795 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2796 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2797 soisconnected(stcb->sctp_socket); 2798 } 2799 } 2800 /* 2801 * since we did not send a HB make sure we don't double 2802 * things 2803 */ 2804 net->hb_responded = 1; 2805 2806 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2807 /* 2808 * We don't need to do the asconf thing, nor hb or 2809 * autoclose if the socket is closed. 2810 */ 2811 goto closed_socket; 2812 } 2813 2814 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2815 stcb, net); 2816 2817 if (stcb->asoc.sctp_autoclose_ticks && 2818 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2819 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2820 stcb->sctp_ep, stcb, NULL); 2821 } 2822 /* 2823 * send ASCONF if parameters are pending and ASCONFs are 2824 * allowed (eg. addresses changed when init/cookie echo were 2825 * in flight) 2826 */ 2827 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2828 (stcb->asoc.asconf_supported == 1) && 2829 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2830 #ifdef SCTP_TIMER_BASED_ASCONF 2831 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2832 stcb->sctp_ep, stcb, 2833 stcb->asoc.primary_destination); 2834 #else 2835 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2836 SCTP_ADDR_NOT_LOCKED); 2837 #endif 2838 } 2839 } 2840 closed_socket: 2841 /* Toss the cookie if I can */ 2842 sctp_toss_old_cookies(stcb, asoc); 2843 /* Restart the timer if we have pending data */ 2844 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2845 if (chk->whoTo != NULL) { 2846 break; 2847 } 2848 } 2849 if (chk != NULL) { 2850 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2851 } 2852 } 2853 2854 static void 2855 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2856 struct sctp_tcb *stcb) 2857 { 2858 struct sctp_nets *net; 2859 struct sctp_tmit_chunk *lchk; 2860 struct sctp_ecne_chunk bkup; 2861 uint8_t override_bit; 2862 uint32_t tsn, window_data_tsn; 2863 int len; 2864 unsigned int pkt_cnt; 2865 2866 len = ntohs(cp->ch.chunk_length); 2867 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2868 /* Its the old format */ 2869 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2870 bkup.num_pkts_since_cwr = htonl(1); 2871 cp = &bkup; 2872 } 2873 SCTP_STAT_INCR(sctps_recvecne); 2874 tsn = ntohl(cp->tsn); 2875 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2876 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2877 if (lchk == NULL) { 2878 window_data_tsn = stcb->asoc.sending_seq - 1; 2879 } else { 2880 window_data_tsn = lchk->rec.data.tsn; 2881 } 2882 2883 /* Find where it was sent to if possible. */ 2884 net = NULL; 2885 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2886 if (lchk->rec.data.tsn == tsn) { 2887 net = lchk->whoTo; 2888 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2889 break; 2890 } 2891 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2892 break; 2893 } 2894 } 2895 if (net == NULL) { 2896 /* 2897 * What to do. A previous send of a CWR was possibly lost. 2898 * See how old it is, we may have it marked on the actual 2899 * net. 2900 */ 2901 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2902 if (tsn == net->last_cwr_tsn) { 2903 /* Found him, send it off */ 2904 break; 2905 } 2906 } 2907 if (net == NULL) { 2908 /* 2909 * If we reach here, we need to send a special CWR 2910 * that says hey, we did this a long time ago and 2911 * you lost the response. 2912 */ 2913 net = TAILQ_FIRST(&stcb->asoc.nets); 2914 if (net == NULL) { 2915 /* TSNH */ 2916 return; 2917 } 2918 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2919 } else { 2920 override_bit = 0; 2921 } 2922 } else { 2923 override_bit = 0; 2924 } 2925 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2926 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2927 /* 2928 * JRS - Use the congestion control given in the pluggable 2929 * CC module 2930 */ 2931 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2932 /* 2933 * We reduce once every RTT. So we will only lower cwnd at 2934 * the next sending seq i.e. the window_data_tsn 2935 */ 2936 net->cwr_window_tsn = window_data_tsn; 2937 net->ecn_ce_pkt_cnt += pkt_cnt; 2938 net->lost_cnt = pkt_cnt; 2939 net->last_cwr_tsn = tsn; 2940 } else { 2941 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2942 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2943 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2944 /* 2945 * Another loss in the same window update how many 2946 * marks/packets lost we have had. 2947 */ 2948 int cnt = 1; 2949 2950 if (pkt_cnt > net->lost_cnt) { 2951 /* Should be the case */ 2952 cnt = (pkt_cnt - net->lost_cnt); 2953 net->ecn_ce_pkt_cnt += cnt; 2954 } 2955 net->lost_cnt = pkt_cnt; 2956 net->last_cwr_tsn = tsn; 2957 /* 2958 * Most CC functions will ignore this call, since we 2959 * are in-window yet of the initial CE the peer saw. 2960 */ 2961 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2962 } 2963 } 2964 /* 2965 * We always send a CWR this way if our previous one was lost our 2966 * peer will get an update, or if it is not time again to reduce we 2967 * still get the cwr to the peer. Note we set the override when we 2968 * could not find the TSN on the chunk or the destination network. 2969 */ 2970 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2971 } 2972 2973 static void 2974 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2975 { 2976 /* 2977 * Here we get a CWR from the peer. We must look in the outqueue and 2978 * make sure that we have a covered ECNE in the control chunk part. 2979 * If so remove it. 2980 */ 2981 struct sctp_tmit_chunk *chk, *nchk; 2982 struct sctp_ecne_chunk *ecne; 2983 int override; 2984 uint32_t cwr_tsn; 2985 2986 cwr_tsn = ntohl(cp->tsn); 2987 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2988 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2989 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2990 continue; 2991 } 2992 if ((override == 0) && (chk->whoTo != net)) { 2993 /* Must be from the right src unless override is set */ 2994 continue; 2995 } 2996 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2997 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2998 /* this covers this ECNE, we can remove it */ 2999 stcb->asoc.ecn_echo_cnt_onq--; 3000 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3001 sctp_next); 3002 stcb->asoc.ctrl_queue_cnt--; 3003 sctp_m_freem(chk->data); 3004 chk->data = NULL; 3005 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3006 if (override == 0) { 3007 break; 3008 } 3009 } 3010 } 3011 } 3012 3013 static void 3014 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3015 struct sctp_tcb *stcb, struct sctp_nets *net) 3016 { 3017 3018 SCTPDBG(SCTP_DEBUG_INPUT2, 3019 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3020 if (stcb == NULL) 3021 return; 3022 3023 /* process according to association state */ 3024 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3025 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3026 SCTPDBG(SCTP_DEBUG_INPUT2, 3027 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3028 SCTP_TCB_UNLOCK(stcb); 3029 return; 3030 } 3031 /* notify upper layer protocol */ 3032 if (stcb->sctp_socket) { 3033 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3034 } 3035 #ifdef INVARIANTS 3036 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3037 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3038 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3039 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3040 } 3041 #endif 3042 /* stop the timer */ 3043 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3044 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3045 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3046 /* free the TCB */ 3047 SCTPDBG(SCTP_DEBUG_INPUT2, 3048 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3049 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3050 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3051 return; 3052 } 3053 3054 static int 3055 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3056 struct sctp_nets *net, uint8_t flg) 3057 { 3058 switch (desc->chunk_type) { 3059 case SCTP_DATA: 3060 case SCTP_IDATA: 3061 /* find the tsn to resend (possibly) */ 3062 { 3063 uint32_t tsn; 3064 struct sctp_tmit_chunk *tp1; 3065 3066 tsn = ntohl(desc->tsn_ifany); 3067 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3068 if (tp1->rec.data.tsn == tsn) { 3069 /* found it */ 3070 break; 3071 } 3072 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3073 /* not found */ 3074 tp1 = NULL; 3075 break; 3076 } 3077 } 3078 if (tp1 == NULL) { 3079 /* 3080 * Do it the other way , aka without paying 3081 * attention to queue seq order. 3082 */ 3083 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3084 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3085 if (tp1->rec.data.tsn == tsn) { 3086 /* found it */ 3087 break; 3088 } 3089 } 3090 } 3091 if (tp1 == NULL) { 3092 SCTP_STAT_INCR(sctps_pdrptsnnf); 3093 } 3094 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3095 if (((flg & SCTP_BADCRC) == 0) && 3096 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3097 return (0); 3098 } 3099 if ((stcb->asoc.peers_rwnd == 0) && 3100 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3101 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3102 return (0); 3103 } 3104 if (stcb->asoc.peers_rwnd == 0 && 3105 (flg & SCTP_FROM_MIDDLE_BOX)) { 3106 SCTP_STAT_INCR(sctps_pdrpdizrw); 3107 return (0); 3108 } 3109 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3110 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3111 /* Payload not matching. */ 3112 SCTP_STAT_INCR(sctps_pdrpbadd); 3113 return (-1); 3114 } 3115 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3116 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3117 /* Payload not matching. */ 3118 SCTP_STAT_INCR(sctps_pdrpbadd); 3119 return (-1); 3120 } 3121 if (tp1->do_rtt) { 3122 /* 3123 * this guy had a RTO calculation 3124 * pending on it, cancel it 3125 */ 3126 if (tp1->whoTo->rto_needed == 0) { 3127 tp1->whoTo->rto_needed = 1; 3128 } 3129 tp1->do_rtt = 0; 3130 } 3131 SCTP_STAT_INCR(sctps_pdrpmark); 3132 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3133 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3134 /* 3135 * mark it as if we were doing a FR, since 3136 * we will be getting gap ack reports behind 3137 * the info from the router. 3138 */ 3139 tp1->rec.data.doing_fast_retransmit = 1; 3140 /* 3141 * mark the tsn with what sequences can 3142 * cause a new FR. 3143 */ 3144 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3145 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3146 } else { 3147 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3148 } 3149 3150 /* restart the timer */ 3151 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3152 stcb, tp1->whoTo, 3153 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3154 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3155 stcb, tp1->whoTo); 3156 3157 /* fix counts and things */ 3158 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3159 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3160 tp1->whoTo->flight_size, 3161 tp1->book_size, 3162 (uint32_t)(uintptr_t)stcb, 3163 tp1->rec.data.tsn); 3164 } 3165 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3166 sctp_flight_size_decrease(tp1); 3167 sctp_total_flight_decrease(stcb, tp1); 3168 } 3169 tp1->sent = SCTP_DATAGRAM_RESEND; 3170 } { 3171 /* audit code */ 3172 unsigned int audit; 3173 3174 audit = 0; 3175 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3176 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3177 audit++; 3178 } 3179 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3180 sctp_next) { 3181 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3182 audit++; 3183 } 3184 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3185 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3186 audit, stcb->asoc.sent_queue_retran_cnt); 3187 #ifndef SCTP_AUDITING_ENABLED 3188 stcb->asoc.sent_queue_retran_cnt = audit; 3189 #endif 3190 } 3191 } 3192 } 3193 break; 3194 case SCTP_ASCONF: 3195 { 3196 struct sctp_tmit_chunk *asconf; 3197 3198 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3199 sctp_next) { 3200 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3201 break; 3202 } 3203 } 3204 if (asconf) { 3205 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3206 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3207 asconf->sent = SCTP_DATAGRAM_RESEND; 3208 asconf->snd_count--; 3209 } 3210 } 3211 break; 3212 case SCTP_INITIATION: 3213 /* resend the INIT */ 3214 stcb->asoc.dropped_special_cnt++; 3215 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3216 /* 3217 * If we can get it in, in a few attempts we do 3218 * this, otherwise we let the timer fire. 3219 */ 3220 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3221 stcb, net, 3222 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3223 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3224 } 3225 break; 3226 case SCTP_SELECTIVE_ACK: 3227 case SCTP_NR_SELECTIVE_ACK: 3228 /* resend the sack */ 3229 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3230 break; 3231 case SCTP_HEARTBEAT_REQUEST: 3232 /* resend a demand HB */ 3233 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3234 /* 3235 * Only retransmit if we KNOW we wont destroy the 3236 * tcb 3237 */ 3238 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3239 } 3240 break; 3241 case SCTP_SHUTDOWN: 3242 sctp_send_shutdown(stcb, net); 3243 break; 3244 case SCTP_SHUTDOWN_ACK: 3245 sctp_send_shutdown_ack(stcb, net); 3246 break; 3247 case SCTP_COOKIE_ECHO: 3248 { 3249 struct sctp_tmit_chunk *cookie; 3250 3251 cookie = NULL; 3252 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3253 sctp_next) { 3254 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3255 break; 3256 } 3257 } 3258 if (cookie) { 3259 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3260 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3261 cookie->sent = SCTP_DATAGRAM_RESEND; 3262 sctp_stop_all_cookie_timers(stcb); 3263 } 3264 } 3265 break; 3266 case SCTP_COOKIE_ACK: 3267 sctp_send_cookie_ack(stcb); 3268 break; 3269 case SCTP_ASCONF_ACK: 3270 /* resend last asconf ack */ 3271 sctp_send_asconf_ack(stcb); 3272 break; 3273 case SCTP_IFORWARD_CUM_TSN: 3274 case SCTP_FORWARD_CUM_TSN: 3275 send_forward_tsn(stcb, &stcb->asoc); 3276 break; 3277 /* can't do anything with these */ 3278 case SCTP_PACKET_DROPPED: 3279 case SCTP_INITIATION_ACK: /* this should not happen */ 3280 case SCTP_HEARTBEAT_ACK: 3281 case SCTP_ABORT_ASSOCIATION: 3282 case SCTP_OPERATION_ERROR: 3283 case SCTP_SHUTDOWN_COMPLETE: 3284 case SCTP_ECN_ECHO: 3285 case SCTP_ECN_CWR: 3286 default: 3287 break; 3288 } 3289 return (0); 3290 } 3291 3292 void 3293 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3294 { 3295 uint32_t i; 3296 uint16_t temp; 3297 3298 /* 3299 * We set things to 0xffffffff since this is the last delivered 3300 * sequence and we will be sending in 0 after the reset. 3301 */ 3302 3303 if (number_entries) { 3304 for (i = 0; i < number_entries; i++) { 3305 temp = ntohs(list[i]); 3306 if (temp >= stcb->asoc.streamincnt) { 3307 continue; 3308 } 3309 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3310 } 3311 } else { 3312 list = NULL; 3313 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3314 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3315 } 3316 } 3317 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3318 } 3319 3320 static void 3321 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3322 { 3323 uint32_t i; 3324 uint16_t temp; 3325 3326 if (number_entries > 0) { 3327 for (i = 0; i < number_entries; i++) { 3328 temp = ntohs(list[i]); 3329 if (temp >= stcb->asoc.streamoutcnt) { 3330 /* no such stream */ 3331 continue; 3332 } 3333 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3334 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3335 } 3336 } else { 3337 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3338 stcb->asoc.strmout[i].next_mid_ordered = 0; 3339 stcb->asoc.strmout[i].next_mid_unordered = 0; 3340 } 3341 } 3342 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3343 } 3344 3345 static void 3346 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3347 { 3348 uint32_t i; 3349 uint16_t temp; 3350 3351 if (number_entries > 0) { 3352 for (i = 0; i < number_entries; i++) { 3353 temp = ntohs(list[i]); 3354 if (temp >= stcb->asoc.streamoutcnt) { 3355 /* no such stream */ 3356 continue; 3357 } 3358 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3359 } 3360 } else { 3361 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3362 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3363 } 3364 } 3365 } 3366 3367 struct sctp_stream_reset_request * 3368 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3369 { 3370 struct sctp_association *asoc; 3371 struct sctp_chunkhdr *ch; 3372 struct sctp_stream_reset_request *r; 3373 struct sctp_tmit_chunk *chk; 3374 int len, clen; 3375 3376 asoc = &stcb->asoc; 3377 chk = asoc->str_reset; 3378 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3379 (chk == NULL)) { 3380 asoc->stream_reset_outstanding = 0; 3381 return (NULL); 3382 } 3383 if (chk->data == NULL) { 3384 return (NULL); 3385 } 3386 if (bchk != NULL) { 3387 /* he wants a copy of the chk pointer */ 3388 *bchk = chk; 3389 } 3390 clen = chk->send_size; 3391 ch = mtod(chk->data, struct sctp_chunkhdr *); 3392 r = (struct sctp_stream_reset_request *)(ch + 1); 3393 if (ntohl(r->request_seq) == seq) { 3394 /* found it */ 3395 return (r); 3396 } 3397 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3398 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3399 /* move to the next one, there can only be a max of two */ 3400 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3401 if (ntohl(r->request_seq) == seq) { 3402 return (r); 3403 } 3404 } 3405 /* that seq is not here */ 3406 return (NULL); 3407 } 3408 3409 static void 3410 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3411 { 3412 struct sctp_association *asoc; 3413 struct sctp_tmit_chunk *chk; 3414 3415 asoc = &stcb->asoc; 3416 chk = asoc->str_reset; 3417 if (chk == NULL) { 3418 return; 3419 } 3420 asoc->str_reset = NULL; 3421 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3422 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3423 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3424 asoc->ctrl_queue_cnt--; 3425 if (chk->data) { 3426 sctp_m_freem(chk->data); 3427 chk->data = NULL; 3428 } 3429 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3430 } 3431 3432 static int 3433 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3434 uint32_t seq, uint32_t action, 3435 struct sctp_stream_reset_response *respin) 3436 { 3437 uint16_t type; 3438 int lparam_len; 3439 struct sctp_association *asoc = &stcb->asoc; 3440 struct sctp_tmit_chunk *chk; 3441 struct sctp_stream_reset_request *req_param; 3442 struct sctp_stream_reset_out_request *req_out_param; 3443 struct sctp_stream_reset_in_request *req_in_param; 3444 uint32_t number_entries; 3445 3446 if (asoc->stream_reset_outstanding == 0) { 3447 /* duplicate */ 3448 return (0); 3449 } 3450 if (seq == stcb->asoc.str_reset_seq_out) { 3451 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3452 if (req_param != NULL) { 3453 stcb->asoc.str_reset_seq_out++; 3454 type = ntohs(req_param->ph.param_type); 3455 lparam_len = ntohs(req_param->ph.param_length); 3456 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3457 int no_clear = 0; 3458 3459 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3460 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3461 asoc->stream_reset_out_is_outstanding = 0; 3462 if (asoc->stream_reset_outstanding) 3463 asoc->stream_reset_outstanding--; 3464 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3465 /* do it */ 3466 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3467 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3468 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3469 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3470 /* 3471 * Set it up so we don't stop 3472 * retransmitting 3473 */ 3474 asoc->stream_reset_outstanding++; 3475 stcb->asoc.str_reset_seq_out--; 3476 asoc->stream_reset_out_is_outstanding = 1; 3477 no_clear = 1; 3478 } else { 3479 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3480 } 3481 if (no_clear == 0) { 3482 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3483 } 3484 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3485 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3486 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3487 if (asoc->stream_reset_outstanding) 3488 asoc->stream_reset_outstanding--; 3489 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3490 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3491 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3492 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3493 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3494 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3495 } 3496 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3497 /* Ok we now may have more streams */ 3498 int num_stream; 3499 3500 num_stream = stcb->asoc.strm_pending_add_size; 3501 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3502 /* TSNH */ 3503 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3504 } 3505 stcb->asoc.strm_pending_add_size = 0; 3506 if (asoc->stream_reset_outstanding) 3507 asoc->stream_reset_outstanding--; 3508 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3509 /* Put the new streams into effect */ 3510 int i; 3511 3512 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3513 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3514 } 3515 asoc->streamoutcnt += num_stream; 3516 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3517 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3518 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3519 SCTP_STREAM_CHANGE_DENIED); 3520 } else { 3521 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3522 SCTP_STREAM_CHANGE_FAILED); 3523 } 3524 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3525 if (asoc->stream_reset_outstanding) 3526 asoc->stream_reset_outstanding--; 3527 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3528 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3529 SCTP_STREAM_CHANGE_DENIED); 3530 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3531 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3532 SCTP_STREAM_CHANGE_FAILED); 3533 } 3534 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3535 /** 3536 * a) Adopt the new in tsn. 3537 * b) reset the map 3538 * c) Adopt the new out-tsn 3539 */ 3540 struct sctp_stream_reset_response_tsn *resp; 3541 struct sctp_forward_tsn_chunk fwdtsn; 3542 int abort_flag = 0; 3543 3544 if (respin == NULL) { 3545 /* huh ? */ 3546 return (0); 3547 } 3548 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3549 return (0); 3550 } 3551 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3552 resp = (struct sctp_stream_reset_response_tsn *)respin; 3553 asoc->stream_reset_outstanding--; 3554 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3555 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3556 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3557 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3558 if (abort_flag) { 3559 return (1); 3560 } 3561 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3562 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3563 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3564 } 3565 3566 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3567 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3568 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3569 3570 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3571 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3572 3573 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3574 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3575 3576 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3577 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3578 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3579 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3580 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3581 SCTP_ASSOC_RESET_DENIED); 3582 } else { 3583 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3584 SCTP_ASSOC_RESET_FAILED); 3585 } 3586 } 3587 /* get rid of the request and get the request flags */ 3588 if (asoc->stream_reset_outstanding == 0) { 3589 sctp_clean_up_stream_reset(stcb); 3590 } 3591 } 3592 } 3593 if (asoc->stream_reset_outstanding == 0) { 3594 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3595 } 3596 return (0); 3597 } 3598 3599 static void 3600 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3601 struct sctp_tmit_chunk *chk, 3602 struct sctp_stream_reset_in_request *req, int trunc) 3603 { 3604 uint32_t seq; 3605 int len, i; 3606 int number_entries; 3607 uint16_t temp; 3608 3609 /* 3610 * peer wants me to send a str-reset to him for my outgoing seq's if 3611 * seq_in is right. 3612 */ 3613 struct sctp_association *asoc = &stcb->asoc; 3614 3615 seq = ntohl(req->request_seq); 3616 if (asoc->str_reset_seq_in == seq) { 3617 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3618 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3619 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3620 } else if (trunc) { 3621 /* Can't do it, since they exceeded our buffer size */ 3622 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3623 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3624 len = ntohs(req->ph.param_length); 3625 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3626 if (number_entries) { 3627 for (i = 0; i < number_entries; i++) { 3628 temp = ntohs(req->list_of_streams[i]); 3629 if (temp >= stcb->asoc.streamoutcnt) { 3630 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3631 goto bad_boy; 3632 } 3633 req->list_of_streams[i] = temp; 3634 } 3635 for (i = 0; i < number_entries; i++) { 3636 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3637 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3638 } 3639 } 3640 } else { 3641 /* Its all */ 3642 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3643 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3644 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3645 } 3646 } 3647 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3648 } else { 3649 /* Can't do it, since we have sent one out */ 3650 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3651 } 3652 bad_boy: 3653 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3654 asoc->str_reset_seq_in++; 3655 } else if (asoc->str_reset_seq_in - 1 == seq) { 3656 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3657 } else if (asoc->str_reset_seq_in - 2 == seq) { 3658 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3659 } else { 3660 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3661 } 3662 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3663 } 3664 3665 static int 3666 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3667 struct sctp_tmit_chunk *chk, 3668 struct sctp_stream_reset_tsn_request *req) 3669 { 3670 /* reset all in and out and update the tsn */ 3671 /* 3672 * A) reset my str-seq's on in and out. B) Select a receive next, 3673 * and set cum-ack to it. Also process this selected number as a 3674 * fwd-tsn as well. C) set in the response my next sending seq. 3675 */ 3676 struct sctp_forward_tsn_chunk fwdtsn; 3677 struct sctp_association *asoc = &stcb->asoc; 3678 int abort_flag = 0; 3679 uint32_t seq; 3680 3681 seq = ntohl(req->request_seq); 3682 if (asoc->str_reset_seq_in == seq) { 3683 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3684 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3685 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3686 } else { 3687 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3688 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3689 fwdtsn.ch.chunk_flags = 0; 3690 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3691 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3692 if (abort_flag) { 3693 return (1); 3694 } 3695 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3696 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3697 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3698 } 3699 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3700 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3701 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3702 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3703 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3704 atomic_add_int(&asoc->sending_seq, 1); 3705 /* save off historical data for retrans */ 3706 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3707 asoc->last_sending_seq[0] = asoc->sending_seq; 3708 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3709 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3710 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3711 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3712 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3713 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3714 } 3715 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3716 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3717 asoc->str_reset_seq_in++; 3718 } else if (asoc->str_reset_seq_in - 1 == seq) { 3719 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3720 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3721 } else if (asoc->str_reset_seq_in - 2 == seq) { 3722 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3723 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3724 } else { 3725 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3726 } 3727 return (0); 3728 } 3729 3730 static void 3731 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3732 struct sctp_tmit_chunk *chk, 3733 struct sctp_stream_reset_out_request *req, int trunc) 3734 { 3735 uint32_t seq, tsn; 3736 int number_entries, len; 3737 struct sctp_association *asoc = &stcb->asoc; 3738 3739 seq = ntohl(req->request_seq); 3740 3741 /* now if its not a duplicate we process it */ 3742 if (asoc->str_reset_seq_in == seq) { 3743 len = ntohs(req->ph.param_length); 3744 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3745 /* 3746 * the sender is resetting, handle the list issue.. we must 3747 * a) verify if we can do the reset, if so no problem b) If 3748 * we can't do the reset we must copy the request. c) queue 3749 * it, and setup the data in processor to trigger it off 3750 * when needed and dequeue all the queued data. 3751 */ 3752 tsn = ntohl(req->send_reset_at_tsn); 3753 3754 /* move the reset action back one */ 3755 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3756 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3757 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3758 } else if (trunc) { 3759 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3760 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3761 /* we can do it now */ 3762 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3763 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3764 } else { 3765 /* 3766 * we must queue it up and thus wait for the TSN's 3767 * to arrive that are at or before tsn 3768 */ 3769 struct sctp_stream_reset_list *liste; 3770 int siz; 3771 3772 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3773 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3774 siz, SCTP_M_STRESET); 3775 if (liste == NULL) { 3776 /* gak out of memory */ 3777 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3778 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3779 return; 3780 } 3781 liste->seq = seq; 3782 liste->tsn = tsn; 3783 liste->number_entries = number_entries; 3784 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3785 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3786 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3787 } 3788 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3789 asoc->str_reset_seq_in++; 3790 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3791 /* 3792 * one seq back, just echo back last action since my 3793 * response was lost. 3794 */ 3795 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3796 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3797 /* 3798 * two seq back, just echo back last action since my 3799 * response was lost. 3800 */ 3801 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3802 } else { 3803 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3804 } 3805 } 3806 3807 static void 3808 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3809 struct sctp_stream_reset_add_strm *str_add) 3810 { 3811 /* 3812 * Peer is requesting to add more streams. If its within our 3813 * max-streams we will allow it. 3814 */ 3815 uint32_t num_stream, i; 3816 uint32_t seq; 3817 struct sctp_association *asoc = &stcb->asoc; 3818 struct sctp_queued_to_read *ctl, *nctl; 3819 3820 /* Get the number. */ 3821 seq = ntohl(str_add->request_seq); 3822 num_stream = ntohs(str_add->number_of_streams); 3823 /* Now what would be the new total? */ 3824 if (asoc->str_reset_seq_in == seq) { 3825 num_stream += stcb->asoc.streamincnt; 3826 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3827 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3828 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3829 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3830 (num_stream > 0xffff)) { 3831 /* We must reject it they ask for to many */ 3832 denied: 3833 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3834 } else { 3835 /* Ok, we can do that :-) */ 3836 struct sctp_stream_in *oldstrm; 3837 3838 /* save off the old */ 3839 oldstrm = stcb->asoc.strmin; 3840 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3841 (num_stream * sizeof(struct sctp_stream_in)), 3842 SCTP_M_STRMI); 3843 if (stcb->asoc.strmin == NULL) { 3844 stcb->asoc.strmin = oldstrm; 3845 goto denied; 3846 } 3847 /* copy off the old data */ 3848 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3849 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3850 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3851 stcb->asoc.strmin[i].sid = i; 3852 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3853 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3854 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3855 /* now anything on those queues? */ 3856 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3857 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3858 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3859 } 3860 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3861 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3862 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3863 } 3864 } 3865 /* Init the new streams */ 3866 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3867 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3868 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3869 stcb->asoc.strmin[i].sid = i; 3870 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3871 stcb->asoc.strmin[i].pd_api_started = 0; 3872 stcb->asoc.strmin[i].delivery_started = 0; 3873 } 3874 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3875 /* update the size */ 3876 stcb->asoc.streamincnt = num_stream; 3877 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3878 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3879 } 3880 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3881 asoc->str_reset_seq_in++; 3882 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3883 /* 3884 * one seq back, just echo back last action since my 3885 * response was lost. 3886 */ 3887 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3888 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3889 /* 3890 * two seq back, just echo back last action since my 3891 * response was lost. 3892 */ 3893 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3894 } else { 3895 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3896 } 3897 } 3898 3899 static void 3900 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3901 struct sctp_stream_reset_add_strm *str_add) 3902 { 3903 /* 3904 * Peer is requesting to add more streams. If its within our 3905 * max-streams we will allow it. 3906 */ 3907 uint16_t num_stream; 3908 uint32_t seq; 3909 struct sctp_association *asoc = &stcb->asoc; 3910 3911 /* Get the number. */ 3912 seq = ntohl(str_add->request_seq); 3913 num_stream = ntohs(str_add->number_of_streams); 3914 /* Now what would be the new total? */ 3915 if (asoc->str_reset_seq_in == seq) { 3916 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3917 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3918 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3919 } else if (stcb->asoc.stream_reset_outstanding) { 3920 /* We must reject it we have something pending */ 3921 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3922 } else { 3923 /* Ok, we can do that :-) */ 3924 int mychk; 3925 3926 mychk = stcb->asoc.streamoutcnt; 3927 mychk += num_stream; 3928 if (mychk < 0x10000) { 3929 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3930 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3931 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3932 } 3933 } else { 3934 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3935 } 3936 } 3937 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3938 asoc->str_reset_seq_in++; 3939 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3940 /* 3941 * one seq back, just echo back last action since my 3942 * response was lost. 3943 */ 3944 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3945 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3946 /* 3947 * two seq back, just echo back last action since my 3948 * response was lost. 3949 */ 3950 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3951 } else { 3952 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3953 } 3954 } 3955 3956 #ifdef __GNUC__ 3957 __attribute__((noinline)) 3958 #endif 3959 static int 3960 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3961 struct sctp_chunkhdr *ch_req) 3962 { 3963 uint16_t remaining_length, param_len, ptype; 3964 struct sctp_paramhdr pstore; 3965 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3966 uint32_t seq = 0; 3967 int num_req = 0; 3968 int trunc = 0; 3969 struct sctp_tmit_chunk *chk; 3970 struct sctp_chunkhdr *ch; 3971 struct sctp_paramhdr *ph; 3972 int ret_code = 0; 3973 int num_param = 0; 3974 3975 /* now it may be a reset or a reset-response */ 3976 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3977 3978 /* setup for adding the response */ 3979 sctp_alloc_a_chunk(stcb, chk); 3980 if (chk == NULL) { 3981 return (ret_code); 3982 } 3983 chk->copy_by_ref = 0; 3984 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3985 chk->rec.chunk_id.can_take_data = 0; 3986 chk->flags = 0; 3987 chk->asoc = &stcb->asoc; 3988 chk->no_fr_allowed = 0; 3989 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3990 chk->book_size_scale = 0; 3991 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3992 if (chk->data == NULL) { 3993 strres_nochunk: 3994 if (chk->data) { 3995 sctp_m_freem(chk->data); 3996 chk->data = NULL; 3997 } 3998 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3999 return (ret_code); 4000 } 4001 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4002 4003 /* setup chunk parameters */ 4004 chk->sent = SCTP_DATAGRAM_UNSENT; 4005 chk->snd_count = 0; 4006 chk->whoTo = NULL; 4007 4008 ch = mtod(chk->data, struct sctp_chunkhdr *); 4009 ch->chunk_type = SCTP_STREAM_RESET; 4010 ch->chunk_flags = 0; 4011 ch->chunk_length = htons(chk->send_size); 4012 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4013 offset += sizeof(struct sctp_chunkhdr); 4014 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4015 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4016 if (ph == NULL) { 4017 /* TSNH */ 4018 break; 4019 } 4020 param_len = ntohs(ph->param_length); 4021 if ((param_len > remaining_length) || 4022 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4023 /* bad parameter length */ 4024 break; 4025 } 4026 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4027 (uint8_t *)&cstore); 4028 if (ph == NULL) { 4029 /* TSNH */ 4030 break; 4031 } 4032 ptype = ntohs(ph->param_type); 4033 num_param++; 4034 if (param_len > sizeof(cstore)) { 4035 trunc = 1; 4036 } else { 4037 trunc = 0; 4038 } 4039 if (num_param > SCTP_MAX_RESET_PARAMS) { 4040 /* hit the max of parameters already sorry.. */ 4041 break; 4042 } 4043 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4044 struct sctp_stream_reset_out_request *req_out; 4045 4046 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4047 break; 4048 } 4049 req_out = (struct sctp_stream_reset_out_request *)ph; 4050 num_req++; 4051 if (stcb->asoc.stream_reset_outstanding) { 4052 seq = ntohl(req_out->response_seq); 4053 if (seq == stcb->asoc.str_reset_seq_out) { 4054 /* implicit ack */ 4055 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4056 } 4057 } 4058 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4059 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4060 struct sctp_stream_reset_add_strm *str_add; 4061 4062 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4063 break; 4064 } 4065 str_add = (struct sctp_stream_reset_add_strm *)ph; 4066 num_req++; 4067 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4068 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4069 struct sctp_stream_reset_add_strm *str_add; 4070 4071 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4072 break; 4073 } 4074 str_add = (struct sctp_stream_reset_add_strm *)ph; 4075 num_req++; 4076 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4077 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4078 struct sctp_stream_reset_in_request *req_in; 4079 4080 num_req++; 4081 req_in = (struct sctp_stream_reset_in_request *)ph; 4082 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4083 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4084 struct sctp_stream_reset_tsn_request *req_tsn; 4085 4086 num_req++; 4087 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4088 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4089 ret_code = 1; 4090 goto strres_nochunk; 4091 } 4092 /* no more */ 4093 break; 4094 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4095 struct sctp_stream_reset_response *resp; 4096 uint32_t result; 4097 4098 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4099 break; 4100 } 4101 resp = (struct sctp_stream_reset_response *)ph; 4102 seq = ntohl(resp->response_seq); 4103 result = ntohl(resp->result); 4104 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4105 ret_code = 1; 4106 goto strres_nochunk; 4107 } 4108 } else { 4109 break; 4110 } 4111 offset += SCTP_SIZE32(param_len); 4112 if (remaining_length >= SCTP_SIZE32(param_len)) { 4113 remaining_length -= SCTP_SIZE32(param_len); 4114 } else { 4115 remaining_length = 0; 4116 } 4117 } 4118 if (num_req == 0) { 4119 /* we have no response free the stuff */ 4120 goto strres_nochunk; 4121 } 4122 /* ok we have a chunk to link in */ 4123 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4124 chk, 4125 sctp_next); 4126 stcb->asoc.ctrl_queue_cnt++; 4127 return (ret_code); 4128 } 4129 4130 /* 4131 * Handle a router or endpoints report of a packet loss, there are two ways 4132 * to handle this, either we get the whole packet and must disect it 4133 * ourselves (possibly with truncation and or corruption) or it is a summary 4134 * from a middle box that did the disecting for us. 4135 */ 4136 static void 4137 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4138 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4139 { 4140 struct sctp_chunk_desc desc; 4141 struct sctp_chunkhdr *chk_hdr; 4142 struct sctp_data_chunk *data_chunk; 4143 struct sctp_idata_chunk *idata_chunk; 4144 uint32_t bottle_bw, on_queue; 4145 uint32_t offset, chk_len; 4146 uint16_t pktdrp_len; 4147 uint8_t pktdrp_flags; 4148 4149 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4150 ("PKTDROP chunk too small")); 4151 pktdrp_flags = cp->ch.chunk_flags; 4152 pktdrp_len = ntohs(cp->ch.chunk_length); 4153 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4154 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4155 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4156 /* The peer plays games with us. */ 4157 return; 4158 } 4159 } 4160 limit -= sizeof(struct sctp_pktdrop_chunk); 4161 offset = 0; 4162 if (offset == limit) { 4163 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4164 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4165 } 4166 } else if (offset + sizeof(struct sctphdr) > limit) { 4167 /* Only a partial SCTP common header. */ 4168 SCTP_STAT_INCR(sctps_pdrpcrupt); 4169 offset = limit; 4170 } else { 4171 /* XXX: Check embedded SCTP common header. */ 4172 offset += sizeof(struct sctphdr); 4173 } 4174 /* Now parse through the chunks themselves. */ 4175 while (offset < limit) { 4176 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4177 SCTP_STAT_INCR(sctps_pdrpcrupt); 4178 break; 4179 } 4180 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4181 desc.chunk_type = chk_hdr->chunk_type; 4182 /* get amount we need to move */ 4183 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4184 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4185 /* Someone is lying... */ 4186 break; 4187 } 4188 if (desc.chunk_type == SCTP_DATA) { 4189 if (stcb->asoc.idata_supported) { 4190 /* Some is playing games with us. */ 4191 break; 4192 } 4193 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4194 /* Some is playing games with us. */ 4195 break; 4196 } 4197 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4198 /* 4199 * Not enough data bytes available in the 4200 * chunk. 4201 */ 4202 SCTP_STAT_INCR(sctps_pdrpnedat); 4203 goto next_chunk; 4204 } 4205 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4206 /* Not enough data in buffer. */ 4207 break; 4208 } 4209 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4210 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4211 desc.tsn_ifany = data_chunk->dp.tsn; 4212 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4213 SCTP_STAT_INCR(sctps_pdrpmbda); 4214 } 4215 } else if (desc.chunk_type == SCTP_IDATA) { 4216 if (!stcb->asoc.idata_supported) { 4217 /* Some is playing games with us. */ 4218 break; 4219 } 4220 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4221 /* Some is playing games with us. */ 4222 break; 4223 } 4224 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4225 /* 4226 * Not enough data bytes available in the 4227 * chunk. 4228 */ 4229 SCTP_STAT_INCR(sctps_pdrpnedat); 4230 goto next_chunk; 4231 } 4232 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4233 /* Not enough data in buffer. */ 4234 break; 4235 } 4236 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4237 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4238 desc.tsn_ifany = idata_chunk->dp.tsn; 4239 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4240 SCTP_STAT_INCR(sctps_pdrpmbda); 4241 } 4242 } else { 4243 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4244 SCTP_STAT_INCR(sctps_pdrpmbct); 4245 } 4246 } 4247 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4248 SCTP_STAT_INCR(sctps_pdrppdbrk); 4249 break; 4250 } 4251 next_chunk: 4252 offset += SCTP_SIZE32(chk_len); 4253 } 4254 /* Now update any rwnd --- possibly */ 4255 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4256 /* From a peer, we get a rwnd report */ 4257 uint32_t a_rwnd; 4258 4259 SCTP_STAT_INCR(sctps_pdrpfehos); 4260 4261 bottle_bw = ntohl(cp->bottle_bw); 4262 on_queue = ntohl(cp->current_onq); 4263 if (bottle_bw && on_queue) { 4264 /* a rwnd report is in here */ 4265 if (bottle_bw > on_queue) 4266 a_rwnd = bottle_bw - on_queue; 4267 else 4268 a_rwnd = 0; 4269 4270 if (a_rwnd == 0) 4271 stcb->asoc.peers_rwnd = 0; 4272 else { 4273 if (a_rwnd > stcb->asoc.total_flight) { 4274 stcb->asoc.peers_rwnd = 4275 a_rwnd - stcb->asoc.total_flight; 4276 } else { 4277 stcb->asoc.peers_rwnd = 0; 4278 } 4279 if (stcb->asoc.peers_rwnd < 4280 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4281 /* SWS sender side engages */ 4282 stcb->asoc.peers_rwnd = 0; 4283 } 4284 } 4285 } 4286 } else { 4287 SCTP_STAT_INCR(sctps_pdrpfmbox); 4288 } 4289 4290 /* now middle boxes in sat networks get a cwnd bump */ 4291 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4292 (stcb->asoc.sat_t3_loss_recovery == 0) && 4293 (stcb->asoc.sat_network)) { 4294 /* 4295 * This is debatable but for sat networks it makes sense 4296 * Note if a T3 timer has went off, we will prohibit any 4297 * changes to cwnd until we exit the t3 loss recovery. 4298 */ 4299 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4300 net, cp, &bottle_bw, &on_queue); 4301 } 4302 } 4303 4304 /* 4305 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4306 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4307 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4308 * length of the complete packet outputs: - length: modified to remaining 4309 * length after control processing - netp: modified to new sctp_nets after 4310 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4311 * bad packet,...) otherwise return the tcb for this packet 4312 */ 4313 #ifdef __GNUC__ 4314 __attribute__((noinline)) 4315 #endif 4316 static struct sctp_tcb * 4317 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4318 struct sockaddr *src, struct sockaddr *dst, 4319 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4320 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4321 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4322 uint32_t vrf_id, uint16_t port) 4323 { 4324 struct sctp_association *asoc; 4325 struct mbuf *op_err; 4326 char msg[SCTP_DIAG_INFO_LEN]; 4327 uint32_t vtag_in; 4328 int num_chunks = 0; /* number of control chunks processed */ 4329 uint32_t chk_length, contiguous; 4330 int ret; 4331 int abort_no_unlock = 0; 4332 int ecne_seen = 0; 4333 int abort_flag; 4334 4335 /* 4336 * How big should this be, and should it be alloc'd? Lets try the 4337 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4338 * until we get into jumbo grams and such.. 4339 */ 4340 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4341 int got_auth = 0; 4342 uint32_t auth_offset = 0, auth_len = 0; 4343 int auth_skipped = 0; 4344 int asconf_cnt = 0; 4345 4346 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4347 iphlen, *offset, length, (void *)stcb); 4348 4349 if (stcb) { 4350 SCTP_TCB_LOCK_ASSERT(stcb); 4351 } 4352 /* validate chunk header length... */ 4353 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4354 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4355 ntohs(ch->chunk_length)); 4356 *offset = length; 4357 return (stcb); 4358 } 4359 /* 4360 * validate the verification tag 4361 */ 4362 vtag_in = ntohl(sh->v_tag); 4363 4364 if (ch->chunk_type == SCTP_INITIATION) { 4365 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4366 ntohs(ch->chunk_length), vtag_in); 4367 if (vtag_in != 0) { 4368 /* protocol error- silently discard... */ 4369 SCTP_STAT_INCR(sctps_badvtag); 4370 if (stcb != NULL) { 4371 SCTP_TCB_UNLOCK(stcb); 4372 } 4373 return (NULL); 4374 } 4375 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4376 /* 4377 * If there is no stcb, skip the AUTH chunk and process 4378 * later after a stcb is found (to validate the lookup was 4379 * valid. 4380 */ 4381 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4382 (stcb == NULL) && 4383 (inp->auth_supported == 1)) { 4384 /* save this chunk for later processing */ 4385 auth_skipped = 1; 4386 auth_offset = *offset; 4387 auth_len = ntohs(ch->chunk_length); 4388 4389 /* (temporarily) move past this chunk */ 4390 *offset += SCTP_SIZE32(auth_len); 4391 if (*offset >= length) { 4392 /* no more data left in the mbuf chain */ 4393 *offset = length; 4394 return (NULL); 4395 } 4396 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4397 sizeof(struct sctp_chunkhdr), chunk_buf); 4398 } 4399 if (ch == NULL) { 4400 /* Help */ 4401 *offset = length; 4402 return (stcb); 4403 } 4404 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4405 goto process_control_chunks; 4406 } 4407 /* 4408 * first check if it's an ASCONF with an unknown src addr we 4409 * need to look inside to find the association 4410 */ 4411 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4412 struct sctp_chunkhdr *asconf_ch = ch; 4413 uint32_t asconf_offset = 0, asconf_len = 0; 4414 4415 /* inp's refcount may be reduced */ 4416 SCTP_INP_INCR_REF(inp); 4417 4418 asconf_offset = *offset; 4419 do { 4420 asconf_len = ntohs(asconf_ch->chunk_length); 4421 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4422 break; 4423 stcb = sctp_findassociation_ep_asconf(m, 4424 *offset, 4425 dst, 4426 sh, &inp, netp, vrf_id); 4427 if (stcb != NULL) 4428 break; 4429 asconf_offset += SCTP_SIZE32(asconf_len); 4430 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4431 sizeof(struct sctp_chunkhdr), chunk_buf); 4432 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4433 if (stcb == NULL) { 4434 /* 4435 * reduce inp's refcount if not reduced in 4436 * sctp_findassociation_ep_asconf(). 4437 */ 4438 SCTP_INP_DECR_REF(inp); 4439 } 4440 4441 /* now go back and verify any auth chunk to be sure */ 4442 if (auth_skipped && (stcb != NULL)) { 4443 struct sctp_auth_chunk *auth; 4444 4445 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4446 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4447 got_auth = 1; 4448 auth_skipped = 0; 4449 } else { 4450 auth = NULL; 4451 } 4452 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4453 auth_offset)) { 4454 /* auth HMAC failed so dump it */ 4455 *offset = length; 4456 return (stcb); 4457 } else { 4458 /* remaining chunks are HMAC checked */ 4459 stcb->asoc.authenticated = 1; 4460 } 4461 } 4462 } 4463 if (stcb == NULL) { 4464 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4465 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4466 msg); 4467 /* no association, so it's out of the blue... */ 4468 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4469 mflowtype, mflowid, inp->fibnum, 4470 vrf_id, port); 4471 *offset = length; 4472 return (NULL); 4473 } 4474 asoc = &stcb->asoc; 4475 /* ABORT and SHUTDOWN can use either v_tag... */ 4476 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4477 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4478 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4479 /* Take the T-bit always into account. */ 4480 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4481 (vtag_in == asoc->my_vtag)) || 4482 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4483 (asoc->peer_vtag != htonl(0)) && 4484 (vtag_in == asoc->peer_vtag))) { 4485 /* this is valid */ 4486 } else { 4487 /* drop this packet... */ 4488 SCTP_STAT_INCR(sctps_badvtag); 4489 if (stcb != NULL) { 4490 SCTP_TCB_UNLOCK(stcb); 4491 } 4492 return (NULL); 4493 } 4494 } else { 4495 /* for all other chunks, vtag must match */ 4496 if (vtag_in != asoc->my_vtag) { 4497 /* invalid vtag... */ 4498 SCTPDBG(SCTP_DEBUG_INPUT3, 4499 "invalid vtag: %xh, expect %xh\n", 4500 vtag_in, asoc->my_vtag); 4501 SCTP_STAT_INCR(sctps_badvtag); 4502 if (stcb != NULL) { 4503 SCTP_TCB_UNLOCK(stcb); 4504 } 4505 *offset = length; 4506 return (NULL); 4507 } 4508 } 4509 } /* end if !SCTP_COOKIE_ECHO */ 4510 /* 4511 * process all control chunks... 4512 */ 4513 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4514 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4515 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4516 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4517 /* implied cookie-ack.. we must have lost the ack */ 4518 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4519 *netp); 4520 } 4521 4522 process_control_chunks: 4523 while (IS_SCTP_CONTROL(ch)) { 4524 /* validate chunk length */ 4525 chk_length = ntohs(ch->chunk_length); 4526 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4527 ch->chunk_type, chk_length); 4528 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4529 if (chk_length < sizeof(*ch) || 4530 (*offset + (int)chk_length) > length) { 4531 *offset = length; 4532 return (stcb); 4533 } 4534 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4535 /* 4536 * INIT and INIT-ACK only gets the init ack "header" portion 4537 * only because we don't have to process the peer's COOKIE. 4538 * All others get a complete chunk. 4539 */ 4540 switch (ch->chunk_type) { 4541 case SCTP_INITIATION: 4542 contiguous = sizeof(struct sctp_init_chunk); 4543 break; 4544 case SCTP_INITIATION_ACK: 4545 contiguous = sizeof(struct sctp_init_ack_chunk); 4546 break; 4547 default: 4548 contiguous = min(chk_length, sizeof(chunk_buf)); 4549 break; 4550 } 4551 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4552 contiguous, 4553 chunk_buf); 4554 if (ch == NULL) { 4555 *offset = length; 4556 return (stcb); 4557 } 4558 4559 num_chunks++; 4560 /* Save off the last place we got a control from */ 4561 if (stcb != NULL) { 4562 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4563 /* 4564 * allow last_control to be NULL if 4565 * ASCONF... ASCONF processing will find the 4566 * right net later 4567 */ 4568 if ((netp != NULL) && (*netp != NULL)) 4569 stcb->asoc.last_control_chunk_from = *netp; 4570 } 4571 } 4572 #ifdef SCTP_AUDITING_ENABLED 4573 sctp_audit_log(0xB0, ch->chunk_type); 4574 #endif 4575 4576 /* check to see if this chunk required auth, but isn't */ 4577 if ((stcb != NULL) && 4578 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4579 !stcb->asoc.authenticated) { 4580 /* "silently" ignore */ 4581 SCTP_STAT_INCR(sctps_recvauthmissing); 4582 goto next_chunk; 4583 } 4584 switch (ch->chunk_type) { 4585 case SCTP_INITIATION: 4586 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4587 /* The INIT chunk must be the only chunk. */ 4588 if ((num_chunks > 1) || 4589 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4590 /* 4591 * RFC 4960bis requires stopping the 4592 * processing of the packet. 4593 */ 4594 *offset = length; 4595 return (stcb); 4596 } 4597 /* Honor our resource limit. */ 4598 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4599 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4600 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4601 mflowtype, mflowid, inp->fibnum, 4602 vrf_id, port); 4603 *offset = length; 4604 if (stcb != NULL) { 4605 SCTP_TCB_UNLOCK(stcb); 4606 } 4607 return (NULL); 4608 } 4609 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4610 (struct sctp_init_chunk *)ch, inp, 4611 stcb, *netp, 4612 mflowtype, mflowid, 4613 vrf_id, port); 4614 *offset = length; 4615 if (stcb != NULL) { 4616 SCTP_TCB_UNLOCK(stcb); 4617 } 4618 return (NULL); 4619 break; 4620 case SCTP_PAD_CHUNK: 4621 break; 4622 case SCTP_INITIATION_ACK: 4623 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4624 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4625 /* We are not interested anymore */ 4626 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4627 ; 4628 } else { 4629 *offset = length; 4630 if (stcb != NULL) { 4631 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4632 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4633 } 4634 return (NULL); 4635 } 4636 } 4637 /* The INIT-ACK chunk must be the only chunk. */ 4638 if ((num_chunks > 1) || 4639 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4640 *offset = length; 4641 return (stcb); 4642 } 4643 if ((netp != NULL) && (*netp != NULL)) { 4644 ret = sctp_handle_init_ack(m, iphlen, *offset, 4645 src, dst, sh, 4646 (struct sctp_init_ack_chunk *)ch, 4647 stcb, *netp, 4648 &abort_no_unlock, 4649 mflowtype, mflowid, 4650 vrf_id); 4651 } else { 4652 ret = -1; 4653 } 4654 *offset = length; 4655 if (abort_no_unlock) { 4656 return (NULL); 4657 } 4658 /* 4659 * Special case, I must call the output routine to 4660 * get the cookie echoed 4661 */ 4662 if ((stcb != NULL) && (ret == 0)) { 4663 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4664 } 4665 return (stcb); 4666 break; 4667 case SCTP_SELECTIVE_ACK: 4668 case SCTP_NR_SELECTIVE_ACK: 4669 { 4670 int abort_now = 0; 4671 uint32_t a_rwnd, cum_ack; 4672 uint16_t num_seg, num_nr_seg, num_dup; 4673 uint8_t flags; 4674 int offset_seg, offset_dup; 4675 4676 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4677 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4678 SCTP_STAT_INCR(sctps_recvsacks); 4679 if (stcb == NULL) { 4680 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4681 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4682 break; 4683 } 4684 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4685 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4686 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4687 break; 4688 } 4689 } else { 4690 if (stcb->asoc.nrsack_supported == 0) { 4691 goto unknown_chunk; 4692 } 4693 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4694 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4695 break; 4696 } 4697 } 4698 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4699 /*- 4700 * If we have sent a shutdown-ack, we will pay no 4701 * attention to a sack sent in to us since 4702 * we don't care anymore. 4703 */ 4704 break; 4705 } 4706 flags = ch->chunk_flags; 4707 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4708 struct sctp_sack_chunk *sack; 4709 4710 sack = (struct sctp_sack_chunk *)ch; 4711 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4712 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4713 num_nr_seg = 0; 4714 num_dup = ntohs(sack->sack.num_dup_tsns); 4715 a_rwnd = ntohl(sack->sack.a_rwnd); 4716 if (sizeof(struct sctp_sack_chunk) + 4717 num_seg * sizeof(struct sctp_gap_ack_block) + 4718 num_dup * sizeof(uint32_t) != chk_length) { 4719 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4720 break; 4721 } 4722 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4723 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4724 } else { 4725 struct sctp_nr_sack_chunk *nr_sack; 4726 4727 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4728 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4729 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4730 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4731 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4732 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4733 if (sizeof(struct sctp_nr_sack_chunk) + 4734 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4735 num_dup * sizeof(uint32_t) != chk_length) { 4736 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4737 break; 4738 } 4739 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4740 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4741 } 4742 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4743 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4744 cum_ack, num_seg, a_rwnd); 4745 stcb->asoc.seen_a_sack_this_pkt = 1; 4746 if ((stcb->asoc.pr_sctp_cnt == 0) && 4747 (num_seg == 0) && (num_nr_seg == 0) && 4748 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4749 (stcb->asoc.saw_sack_with_frags == 0) && 4750 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4751 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4752 /* 4753 * We have a SIMPLE sack having no 4754 * prior segments and data on sent 4755 * queue to be acked. Use the faster 4756 * path sack processing. We also 4757 * allow window update sacks with no 4758 * missing segments to go this way 4759 * too. 4760 */ 4761 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4762 &abort_now, ecne_seen); 4763 } else { 4764 if ((netp != NULL) && (*netp != NULL)) { 4765 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4766 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4767 cum_ack, a_rwnd, ecne_seen); 4768 } 4769 } 4770 if (abort_now) { 4771 /* ABORT signal from sack processing */ 4772 *offset = length; 4773 return (NULL); 4774 } 4775 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4776 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4777 (stcb->asoc.stream_queue_cnt == 0)) { 4778 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4779 } 4780 break; 4781 } 4782 case SCTP_HEARTBEAT_REQUEST: 4783 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4784 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4785 SCTP_STAT_INCR(sctps_recvheartbeat); 4786 sctp_send_heartbeat_ack(stcb, m, *offset, 4787 chk_length, *netp); 4788 } 4789 break; 4790 case SCTP_HEARTBEAT_ACK: 4791 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4792 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4793 /* Its not ours */ 4794 break; 4795 } 4796 SCTP_STAT_INCR(sctps_recvheartbeatack); 4797 if ((netp != NULL) && (*netp != NULL)) { 4798 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4799 stcb, *netp); 4800 } 4801 break; 4802 case SCTP_ABORT_ASSOCIATION: 4803 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4804 (void *)stcb); 4805 *offset = length; 4806 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4807 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4808 return (NULL); 4809 } else { 4810 return (stcb); 4811 } 4812 } else { 4813 return (NULL); 4814 } 4815 break; 4816 case SCTP_SHUTDOWN: 4817 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4818 (void *)stcb); 4819 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4820 break; 4821 } 4822 if ((netp != NULL) && (*netp != NULL)) { 4823 abort_flag = 0; 4824 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4825 stcb, *netp, &abort_flag); 4826 if (abort_flag) { 4827 *offset = length; 4828 return (NULL); 4829 } 4830 } 4831 break; 4832 case SCTP_SHUTDOWN_ACK: 4833 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4834 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4835 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4836 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4837 *offset = length; 4838 return (NULL); 4839 } 4840 break; 4841 case SCTP_OPERATION_ERROR: 4842 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4843 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4844 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4845 *offset = length; 4846 return (NULL); 4847 } 4848 break; 4849 case SCTP_COOKIE_ECHO: 4850 SCTPDBG(SCTP_DEBUG_INPUT3, 4851 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4852 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4853 ; 4854 } else { 4855 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4856 /* We are not interested anymore */ 4857 abend: 4858 if (stcb != NULL) { 4859 SCTP_TCB_UNLOCK(stcb); 4860 } 4861 *offset = length; 4862 return (NULL); 4863 } 4864 } 4865 /*- 4866 * First are we accepting? We do this again here 4867 * since it is possible that a previous endpoint WAS 4868 * listening responded to a INIT-ACK and then 4869 * closed. We opened and bound.. and are now no 4870 * longer listening. 4871 * 4872 * XXXGL: notes on checking listen queue length. 4873 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4874 * SOLISTENING(), because a listening "UDP type" 4875 * socket isn't listening in terms of the socket 4876 * layer. It is a normal data flow socket, that 4877 * can fork off new connections. Thus, we should 4878 * look into sol_qlen only in case we are !UDP. 4879 * 2) Checking sol_qlen in general requires locking 4880 * the socket, and this code lacks that. 4881 */ 4882 if ((stcb == NULL) && 4883 (!SCTP_IS_LISTENING(inp) || 4884 (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) && 4885 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4886 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4887 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4888 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4889 sctp_abort_association(inp, stcb, m, iphlen, 4890 src, dst, sh, op_err, 4891 mflowtype, mflowid, 4892 vrf_id, port); 4893 } 4894 *offset = length; 4895 return (NULL); 4896 } else { 4897 struct mbuf *ret_buf; 4898 struct sctp_inpcb *linp; 4899 struct sctp_tmit_chunk *chk; 4900 4901 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4902 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4903 goto abend; 4904 } 4905 4906 if (stcb) { 4907 linp = NULL; 4908 } else { 4909 linp = inp; 4910 } 4911 4912 if (linp != NULL) { 4913 SCTP_ASOC_CREATE_LOCK(linp); 4914 } 4915 4916 if (netp != NULL) { 4917 struct sctp_tcb *locked_stcb; 4918 4919 locked_stcb = stcb; 4920 ret_buf = 4921 sctp_handle_cookie_echo(m, iphlen, 4922 *offset, 4923 src, dst, 4924 sh, 4925 (struct sctp_cookie_echo_chunk *)ch, 4926 &inp, &stcb, netp, 4927 auth_skipped, 4928 auth_offset, 4929 auth_len, 4930 &locked_stcb, 4931 mflowtype, 4932 mflowid, 4933 vrf_id, 4934 port); 4935 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4936 SCTP_TCB_UNLOCK(locked_stcb); 4937 } 4938 if (stcb != NULL) { 4939 SCTP_TCB_LOCK_ASSERT(stcb); 4940 } 4941 } else { 4942 ret_buf = NULL; 4943 } 4944 if (linp != NULL) { 4945 SCTP_ASOC_CREATE_UNLOCK(linp); 4946 } 4947 if (ret_buf == NULL) { 4948 if (stcb != NULL) { 4949 SCTP_TCB_UNLOCK(stcb); 4950 } 4951 SCTPDBG(SCTP_DEBUG_INPUT3, 4952 "GAK, null buffer\n"); 4953 *offset = length; 4954 return (NULL); 4955 } 4956 /* if AUTH skipped, see if it verified... */ 4957 if (auth_skipped) { 4958 got_auth = 1; 4959 auth_skipped = 0; 4960 } 4961 /* Restart the timer if we have pending data */ 4962 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4963 if (chk->whoTo != NULL) { 4964 break; 4965 } 4966 } 4967 if (chk != NULL) { 4968 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4969 } 4970 } 4971 break; 4972 case SCTP_COOKIE_ACK: 4973 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4974 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4975 break; 4976 } 4977 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4978 /* We are not interested anymore */ 4979 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4980 ; 4981 } else if (stcb) { 4982 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4983 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4984 *offset = length; 4985 return (NULL); 4986 } 4987 } 4988 if ((netp != NULL) && (*netp != NULL)) { 4989 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4990 } 4991 break; 4992 case SCTP_ECN_ECHO: 4993 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4994 if (stcb == NULL) { 4995 break; 4996 } 4997 if (stcb->asoc.ecn_supported == 0) { 4998 goto unknown_chunk; 4999 } 5000 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5001 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5002 break; 5003 } 5004 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5005 ecne_seen = 1; 5006 break; 5007 case SCTP_ECN_CWR: 5008 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5009 if (stcb == NULL) { 5010 break; 5011 } 5012 if (stcb->asoc.ecn_supported == 0) { 5013 goto unknown_chunk; 5014 } 5015 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5016 break; 5017 } 5018 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5019 break; 5020 case SCTP_SHUTDOWN_COMPLETE: 5021 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5022 /* must be first and only chunk */ 5023 if ((num_chunks > 1) || 5024 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5025 *offset = length; 5026 return (stcb); 5027 } 5028 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5029 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5030 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5031 stcb, *netp); 5032 *offset = length; 5033 return (NULL); 5034 } 5035 break; 5036 case SCTP_ASCONF: 5037 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5038 if (stcb != NULL) { 5039 if (stcb->asoc.asconf_supported == 0) { 5040 goto unknown_chunk; 5041 } 5042 sctp_handle_asconf(m, *offset, src, 5043 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5044 asconf_cnt++; 5045 } 5046 break; 5047 case SCTP_ASCONF_ACK: 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5049 if (stcb == NULL) { 5050 break; 5051 } 5052 if (stcb->asoc.asconf_supported == 0) { 5053 goto unknown_chunk; 5054 } 5055 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5056 break; 5057 } 5058 if ((netp != NULL) && (*netp != NULL)) { 5059 /* He's alive so give him credit */ 5060 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5061 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5062 stcb->asoc.overall_error_count, 5063 0, 5064 SCTP_FROM_SCTP_INPUT, 5065 __LINE__); 5066 } 5067 stcb->asoc.overall_error_count = 0; 5068 sctp_handle_asconf_ack(m, *offset, 5069 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5070 if (abort_no_unlock) 5071 return (NULL); 5072 } 5073 break; 5074 case SCTP_FORWARD_CUM_TSN: 5075 case SCTP_IFORWARD_CUM_TSN: 5076 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5077 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5078 if (stcb == NULL) { 5079 break; 5080 } 5081 if (stcb->asoc.prsctp_supported == 0) { 5082 goto unknown_chunk; 5083 } 5084 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5085 break; 5086 } 5087 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5088 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5089 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5090 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5091 } else { 5092 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5093 } 5094 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5095 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5096 *offset = length; 5097 return (NULL); 5098 } 5099 *fwd_tsn_seen = 1; 5100 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5101 /* We are not interested anymore */ 5102 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5103 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5104 *offset = length; 5105 return (NULL); 5106 } 5107 /* 5108 * For sending a SACK this looks like DATA chunks. 5109 */ 5110 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5111 abort_flag = 0; 5112 sctp_handle_forward_tsn(stcb, 5113 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5114 if (abort_flag) { 5115 *offset = length; 5116 return (NULL); 5117 } 5118 break; 5119 case SCTP_STREAM_RESET: 5120 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5121 if (stcb == NULL) { 5122 break; 5123 } 5124 if (stcb->asoc.reconfig_supported == 0) { 5125 goto unknown_chunk; 5126 } 5127 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5128 break; 5129 } 5130 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5131 /* stop processing */ 5132 *offset = length; 5133 return (NULL); 5134 } 5135 break; 5136 case SCTP_PACKET_DROPPED: 5137 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5138 if (stcb == NULL) { 5139 break; 5140 } 5141 if (stcb->asoc.pktdrop_supported == 0) { 5142 goto unknown_chunk; 5143 } 5144 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5145 break; 5146 } 5147 if ((netp != NULL) && (*netp != NULL)) { 5148 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5149 stcb, *netp, 5150 min(chk_length, contiguous)); 5151 } 5152 break; 5153 case SCTP_AUTHENTICATION: 5154 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5155 if (stcb == NULL) { 5156 /* save the first AUTH for later processing */ 5157 if (auth_skipped == 0) { 5158 auth_offset = *offset; 5159 auth_len = chk_length; 5160 auth_skipped = 1; 5161 } 5162 /* skip this chunk (temporarily) */ 5163 break; 5164 } 5165 if (stcb->asoc.auth_supported == 0) { 5166 goto unknown_chunk; 5167 } 5168 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5169 (chk_length > (sizeof(struct sctp_auth_chunk) + 5170 SCTP_AUTH_DIGEST_LEN_MAX))) { 5171 /* Its not ours */ 5172 *offset = length; 5173 return (stcb); 5174 } 5175 if (got_auth == 1) { 5176 /* skip this chunk... it's already auth'd */ 5177 break; 5178 } 5179 got_auth = 1; 5180 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5181 /* auth HMAC failed so dump the packet */ 5182 *offset = length; 5183 return (stcb); 5184 } else { 5185 /* remaining chunks are HMAC checked */ 5186 stcb->asoc.authenticated = 1; 5187 } 5188 break; 5189 5190 default: 5191 unknown_chunk: 5192 /* it's an unknown chunk! */ 5193 if ((ch->chunk_type & 0x40) && 5194 (stcb != NULL) && 5195 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5196 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5197 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5198 struct sctp_gen_error_cause *cause; 5199 int len; 5200 5201 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5202 0, M_NOWAIT, 1, MT_DATA); 5203 if (op_err != NULL) { 5204 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5205 cause = mtod(op_err, struct sctp_gen_error_cause *); 5206 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5207 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5208 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5209 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5210 if (SCTP_BUF_NEXT(op_err) != NULL) { 5211 #ifdef SCTP_MBUF_LOGGING 5212 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5213 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5214 } 5215 #endif 5216 sctp_queue_op_err(stcb, op_err); 5217 } else { 5218 sctp_m_freem(op_err); 5219 } 5220 } 5221 } 5222 if ((ch->chunk_type & 0x80) == 0) { 5223 /* discard this packet */ 5224 *offset = length; 5225 return (stcb); 5226 } /* else skip this bad chunk and continue... */ 5227 break; 5228 } /* switch (ch->chunk_type) */ 5229 5230 next_chunk: 5231 /* get the next chunk */ 5232 *offset += SCTP_SIZE32(chk_length); 5233 if (*offset >= length) { 5234 /* no more data left in the mbuf chain */ 5235 break; 5236 } 5237 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5238 sizeof(struct sctp_chunkhdr), chunk_buf); 5239 if (ch == NULL) { 5240 *offset = length; 5241 return (stcb); 5242 } 5243 } /* while */ 5244 5245 if ((asconf_cnt > 0) && (stcb != NULL)) { 5246 sctp_send_asconf_ack(stcb); 5247 } 5248 return (stcb); 5249 } 5250 5251 /* 5252 * common input chunk processing (v4 and v6) 5253 */ 5254 void 5255 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5256 struct sockaddr *src, struct sockaddr *dst, 5257 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5258 uint8_t compute_crc, 5259 uint8_t ecn_bits, 5260 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5261 uint32_t vrf_id, uint16_t port) 5262 { 5263 uint32_t high_tsn; 5264 int fwd_tsn_seen = 0, data_processed = 0; 5265 struct mbuf *m = *mm, *op_err; 5266 char msg[SCTP_DIAG_INFO_LEN]; 5267 int un_sent; 5268 int cnt_ctrl_ready = 0; 5269 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5270 struct sctp_tcb *stcb = NULL; 5271 struct sctp_nets *net = NULL; 5272 5273 SCTP_STAT_INCR(sctps_recvdatagrams); 5274 #ifdef SCTP_AUDITING_ENABLED 5275 sctp_audit_log(0xE0, 1); 5276 sctp_auditing(0, inp, stcb, net); 5277 #endif 5278 if (compute_crc != 0) { 5279 uint32_t check, calc_check; 5280 5281 check = sh->checksum; 5282 sh->checksum = 0; 5283 calc_check = sctp_calculate_cksum(m, iphlen); 5284 sh->checksum = check; 5285 if (calc_check != check) { 5286 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5287 calc_check, check, (void *)m, length, iphlen); 5288 stcb = sctp_findassociation_addr(m, offset, src, dst, 5289 sh, ch, &inp, &net, vrf_id); 5290 #if defined(INET) || defined(INET6) 5291 if ((ch->chunk_type != SCTP_INITIATION) && 5292 (net != NULL) && (net->port != port)) { 5293 if (net->port == 0) { 5294 /* UDP encapsulation turned on. */ 5295 net->mtu -= sizeof(struct udphdr); 5296 if (stcb->asoc.smallest_mtu > net->mtu) { 5297 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5298 } 5299 } else if (port == 0) { 5300 /* UDP encapsulation turned off. */ 5301 net->mtu += sizeof(struct udphdr); 5302 /* XXX Update smallest_mtu */ 5303 } 5304 net->port = port; 5305 } 5306 #endif 5307 if (net != NULL) { 5308 net->flowtype = mflowtype; 5309 net->flowid = mflowid; 5310 } 5311 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5312 if ((inp != NULL) && (stcb != NULL)) { 5313 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5314 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5315 } else if ((inp != NULL) && (stcb == NULL)) { 5316 inp_decr = inp; 5317 } 5318 SCTP_STAT_INCR(sctps_badsum); 5319 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5320 goto out; 5321 } 5322 } 5323 /* Destination port of 0 is illegal, based on RFC4960. */ 5324 if (sh->dest_port == 0) { 5325 SCTP_STAT_INCR(sctps_hdrops); 5326 goto out; 5327 } 5328 stcb = sctp_findassociation_addr(m, offset, src, dst, 5329 sh, ch, &inp, &net, vrf_id); 5330 #if defined(INET) || defined(INET6) 5331 if ((ch->chunk_type != SCTP_INITIATION) && 5332 (net != NULL) && (net->port != port)) { 5333 if (net->port == 0) { 5334 /* UDP encapsulation turned on. */ 5335 net->mtu -= sizeof(struct udphdr); 5336 if (stcb->asoc.smallest_mtu > net->mtu) { 5337 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5338 } 5339 } else if (port == 0) { 5340 /* UDP encapsulation turned off. */ 5341 net->mtu += sizeof(struct udphdr); 5342 /* XXX Update smallest_mtu */ 5343 } 5344 net->port = port; 5345 } 5346 #endif 5347 if (net != NULL) { 5348 net->flowtype = mflowtype; 5349 net->flowid = mflowid; 5350 } 5351 if (inp == NULL) { 5352 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5353 SCTP_STAT_INCR(sctps_noport); 5354 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5355 goto out; 5356 } 5357 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5358 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5359 sctp_send_shutdown_complete2(src, dst, sh, 5360 mflowtype, mflowid, fibnum, 5361 vrf_id, port); 5362 goto out; 5363 } 5364 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5365 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5366 goto out; 5367 } 5368 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5369 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5370 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5371 (ch->chunk_type != SCTP_INIT))) { 5372 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5373 "Out of the blue"); 5374 sctp_send_abort(m, iphlen, src, dst, 5375 sh, 0, op_err, 5376 mflowtype, mflowid, fibnum, 5377 vrf_id, port); 5378 } 5379 } 5380 goto out; 5381 } else if (stcb == NULL) { 5382 inp_decr = inp; 5383 } 5384 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5385 (void *)m, iphlen, offset, length, (void *)stcb); 5386 if (stcb) { 5387 /* always clear this before beginning a packet */ 5388 stcb->asoc.authenticated = 0; 5389 stcb->asoc.seen_a_sack_this_pkt = 0; 5390 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5391 (void *)stcb, stcb->asoc.state); 5392 5393 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5394 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5395 /*- 5396 * If we hit here, we had a ref count 5397 * up when the assoc was aborted and the 5398 * timer is clearing out the assoc, we should 5399 * NOT respond to any packet.. its OOTB. 5400 */ 5401 SCTP_TCB_UNLOCK(stcb); 5402 stcb = NULL; 5403 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5404 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5405 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5406 msg); 5407 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5408 mflowtype, mflowid, inp->fibnum, 5409 vrf_id, port); 5410 goto out; 5411 } 5412 } 5413 if (IS_SCTP_CONTROL(ch)) { 5414 /* process the control portion of the SCTP packet */ 5415 /* sa_ignore NO_NULL_CHK */ 5416 stcb = sctp_process_control(m, iphlen, &offset, length, 5417 src, dst, sh, ch, 5418 inp, stcb, &net, &fwd_tsn_seen, 5419 mflowtype, mflowid, fibnum, 5420 vrf_id, port); 5421 if (stcb) { 5422 /* 5423 * This covers us if the cookie-echo was there and 5424 * it changes our INP. 5425 */ 5426 inp = stcb->sctp_ep; 5427 #if defined(INET) || defined(INET6) 5428 if ((ch->chunk_type != SCTP_INITIATION) && 5429 (net != NULL) && (net->port != port)) { 5430 if (net->port == 0) { 5431 /* UDP encapsulation turned on. */ 5432 net->mtu -= sizeof(struct udphdr); 5433 if (stcb->asoc.smallest_mtu > net->mtu) { 5434 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5435 } 5436 } else if (port == 0) { 5437 /* UDP encapsulation turned off. */ 5438 net->mtu += sizeof(struct udphdr); 5439 /* XXX Update smallest_mtu */ 5440 } 5441 net->port = port; 5442 } 5443 #endif 5444 } 5445 } else { 5446 /* 5447 * no control chunks, so pre-process DATA chunks (these 5448 * checks are taken care of by control processing) 5449 */ 5450 5451 /* 5452 * if DATA only packet, and auth is required, then punt... 5453 * can't have authenticated without any AUTH (control) 5454 * chunks 5455 */ 5456 if ((stcb != NULL) && 5457 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5458 /* "silently" ignore */ 5459 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5460 SCTP_STAT_INCR(sctps_recvauthmissing); 5461 goto out; 5462 } 5463 if (stcb == NULL) { 5464 /* out of the blue DATA chunk */ 5465 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5466 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5467 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5468 msg); 5469 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5470 mflowtype, mflowid, fibnum, 5471 vrf_id, port); 5472 goto out; 5473 } 5474 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5475 /* v_tag mismatch! */ 5476 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5477 SCTP_STAT_INCR(sctps_badvtag); 5478 goto out; 5479 } 5480 } 5481 5482 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5483 if (stcb == NULL) { 5484 /* 5485 * no valid TCB for this packet, or we found it's a bad 5486 * packet while processing control, or we're done with this 5487 * packet (done or skip rest of data), so we drop it... 5488 */ 5489 goto out; 5490 } 5491 5492 /* 5493 * DATA chunk processing 5494 */ 5495 /* plow through the data chunks while length > offset */ 5496 5497 /* 5498 * Rest should be DATA only. Check authentication state if AUTH for 5499 * DATA is required. 5500 */ 5501 if ((length > offset) && 5502 (stcb != NULL) && 5503 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5504 !stcb->asoc.authenticated) { 5505 /* "silently" ignore */ 5506 SCTP_STAT_INCR(sctps_recvauthmissing); 5507 SCTPDBG(SCTP_DEBUG_AUTH1, 5508 "Data chunk requires AUTH, skipped\n"); 5509 goto trigger_send; 5510 } 5511 if (length > offset) { 5512 int retval; 5513 5514 /* 5515 * First check to make sure our state is correct. We would 5516 * not get here unless we really did have a tag, so we don't 5517 * abort if this happens, just dump the chunk silently. 5518 */ 5519 switch (SCTP_GET_STATE(stcb)) { 5520 case SCTP_STATE_COOKIE_ECHOED: 5521 /* 5522 * we consider data with valid tags in this state 5523 * shows us the cookie-ack was lost. Imply it was 5524 * there. 5525 */ 5526 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5527 break; 5528 case SCTP_STATE_COOKIE_WAIT: 5529 /* 5530 * We consider OOTB any data sent during asoc setup. 5531 */ 5532 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5533 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5534 msg); 5535 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5536 mflowtype, mflowid, inp->fibnum, 5537 vrf_id, port); 5538 goto out; 5539 /* sa_ignore NOTREACHED */ 5540 break; 5541 case SCTP_STATE_EMPTY: /* should not happen */ 5542 case SCTP_STATE_INUSE: /* should not happen */ 5543 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5544 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5545 default: 5546 goto out; 5547 /* sa_ignore NOTREACHED */ 5548 break; 5549 case SCTP_STATE_OPEN: 5550 case SCTP_STATE_SHUTDOWN_SENT: 5551 break; 5552 } 5553 /* plow through the data chunks while length > offset */ 5554 retval = sctp_process_data(mm, iphlen, &offset, length, 5555 inp, stcb, net, &high_tsn); 5556 if (retval == 2) { 5557 /* 5558 * The association aborted, NO UNLOCK needed since 5559 * the association is destroyed. 5560 */ 5561 stcb = NULL; 5562 goto out; 5563 } 5564 if (retval == 0) { 5565 data_processed = 1; 5566 } 5567 /* 5568 * Anything important needs to have been m_copy'ed in 5569 * process_data 5570 */ 5571 } 5572 5573 /* take care of ecn */ 5574 if ((data_processed == 1) && 5575 (stcb->asoc.ecn_supported == 1) && 5576 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5577 /* Yep, we need to add a ECNE */ 5578 sctp_send_ecn_echo(stcb, net, high_tsn); 5579 } 5580 5581 if ((data_processed == 0) && (fwd_tsn_seen)) { 5582 int was_a_gap; 5583 uint32_t highest_tsn; 5584 5585 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5586 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5587 } else { 5588 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5589 } 5590 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5591 stcb->asoc.send_sack = 1; 5592 sctp_sack_check(stcb, was_a_gap); 5593 } else if (fwd_tsn_seen) { 5594 stcb->asoc.send_sack = 1; 5595 } 5596 /* trigger send of any chunks in queue... */ 5597 trigger_send: 5598 #ifdef SCTP_AUDITING_ENABLED 5599 sctp_audit_log(0xE0, 2); 5600 sctp_auditing(1, inp, stcb, net); 5601 #endif 5602 SCTPDBG(SCTP_DEBUG_INPUT1, 5603 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5604 stcb->asoc.peers_rwnd, 5605 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5606 stcb->asoc.total_flight); 5607 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5608 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5609 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5610 } 5611 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5612 cnt_ctrl_ready || 5613 stcb->asoc.trigger_reset || 5614 ((un_sent > 0) && 5615 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5616 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5617 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5618 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5619 } 5620 #ifdef SCTP_AUDITING_ENABLED 5621 sctp_audit_log(0xE0, 3); 5622 sctp_auditing(2, inp, stcb, net); 5623 #endif 5624 out: 5625 if (stcb != NULL) { 5626 SCTP_TCB_UNLOCK(stcb); 5627 } 5628 if (inp_decr != NULL) { 5629 /* reduce ref-count */ 5630 SCTP_INP_WLOCK(inp_decr); 5631 SCTP_INP_DECR_REF(inp_decr); 5632 SCTP_INP_WUNLOCK(inp_decr); 5633 } 5634 return; 5635 } 5636 5637 #ifdef INET 5638 void 5639 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5640 { 5641 struct mbuf *m; 5642 int iphlen; 5643 uint32_t vrf_id = 0; 5644 uint8_t ecn_bits; 5645 struct sockaddr_in src, dst; 5646 struct ip *ip; 5647 struct sctphdr *sh; 5648 struct sctp_chunkhdr *ch; 5649 int length, offset; 5650 uint8_t compute_crc; 5651 uint32_t mflowid; 5652 uint8_t mflowtype; 5653 uint16_t fibnum; 5654 5655 iphlen = off; 5656 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5657 SCTP_RELEASE_PKT(i_pak); 5658 return; 5659 } 5660 m = SCTP_HEADER_TO_CHAIN(i_pak); 5661 #ifdef SCTP_MBUF_LOGGING 5662 /* Log in any input mbufs */ 5663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5664 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5665 } 5666 #endif 5667 #ifdef SCTP_PACKET_LOGGING 5668 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5669 sctp_packet_log(m); 5670 } 5671 #endif 5672 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5673 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5674 m->m_pkthdr.len, 5675 if_name(m->m_pkthdr.rcvif), 5676 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5677 mflowid = m->m_pkthdr.flowid; 5678 mflowtype = M_HASHTYPE_GET(m); 5679 fibnum = M_GETFIB(m); 5680 SCTP_STAT_INCR(sctps_recvpackets); 5681 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5682 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5683 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5684 if (SCTP_BUF_LEN(m) < offset) { 5685 if ((m = m_pullup(m, offset)) == NULL) { 5686 SCTP_STAT_INCR(sctps_hdrops); 5687 return; 5688 } 5689 } 5690 ip = mtod(m, struct ip *); 5691 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5692 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5693 offset -= sizeof(struct sctp_chunkhdr); 5694 memset(&src, 0, sizeof(struct sockaddr_in)); 5695 src.sin_family = AF_INET; 5696 src.sin_len = sizeof(struct sockaddr_in); 5697 src.sin_port = sh->src_port; 5698 src.sin_addr = ip->ip_src; 5699 memset(&dst, 0, sizeof(struct sockaddr_in)); 5700 dst.sin_family = AF_INET; 5701 dst.sin_len = sizeof(struct sockaddr_in); 5702 dst.sin_port = sh->dest_port; 5703 dst.sin_addr = ip->ip_dst; 5704 length = ntohs(ip->ip_len); 5705 /* Validate mbuf chain length with IP payload length. */ 5706 if (SCTP_HEADER_LEN(m) != length) { 5707 SCTPDBG(SCTP_DEBUG_INPUT1, 5708 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5709 SCTP_STAT_INCR(sctps_hdrops); 5710 goto out; 5711 } 5712 /* SCTP does not allow broadcasts or multicasts */ 5713 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5714 goto out; 5715 } 5716 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5717 goto out; 5718 } 5719 ecn_bits = ip->ip_tos; 5720 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5721 SCTP_STAT_INCR(sctps_recvhwcrc); 5722 compute_crc = 0; 5723 } else { 5724 SCTP_STAT_INCR(sctps_recvswcrc); 5725 compute_crc = 1; 5726 } 5727 sctp_common_input_processing(&m, iphlen, offset, length, 5728 (struct sockaddr *)&src, 5729 (struct sockaddr *)&dst, 5730 sh, ch, 5731 compute_crc, 5732 ecn_bits, 5733 mflowtype, mflowid, fibnum, 5734 vrf_id, port); 5735 out: 5736 if (m) { 5737 sctp_m_freem(m); 5738 } 5739 return; 5740 } 5741 5742 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5743 extern int *sctp_cpuarry; 5744 #endif 5745 5746 int 5747 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5748 { 5749 struct mbuf *m; 5750 int off; 5751 5752 m = *mp; 5753 off = *offp; 5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5755 if (mp_ncpus > 1) { 5756 struct ip *ip; 5757 struct sctphdr *sh; 5758 int offset; 5759 int cpu_to_use; 5760 uint32_t flowid, tag; 5761 5762 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5763 flowid = m->m_pkthdr.flowid; 5764 } else { 5765 /* 5766 * No flow id built by lower layers fix it so we 5767 * create one. 5768 */ 5769 offset = off + sizeof(struct sctphdr); 5770 if (SCTP_BUF_LEN(m) < offset) { 5771 if ((m = m_pullup(m, offset)) == NULL) { 5772 SCTP_STAT_INCR(sctps_hdrops); 5773 return (IPPROTO_DONE); 5774 } 5775 } 5776 ip = mtod(m, struct ip *); 5777 sh = (struct sctphdr *)((caddr_t)ip + off); 5778 tag = htonl(sh->v_tag); 5779 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5780 m->m_pkthdr.flowid = flowid; 5781 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5782 } 5783 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5784 sctp_queue_to_mcore(m, off, cpu_to_use); 5785 return (IPPROTO_DONE); 5786 } 5787 #endif 5788 sctp_input_with_port(m, off, 0); 5789 return (IPPROTO_DONE); 5790 } 5791 #endif 5792